Reddit mentions of Monoprice Cable tie mounts 25x25(mm), 100pcs/Pack - white

Cable management

Zip ties

Tie down

headphone puck

Maybe an Ikea cabinet to go under the desk, you can take two legs off and prop the desk on two legs on one side and the cabinet on the other, that will help with moving things off your desk (electrical tape, Xbox game, controller)

If it's going to be hidden away and you're ok with adhesive on that part of the cabinet, then one option is zip tie anchors. Beyond that, there are Nail-In options and cable clips. Amazon is your friend!

I mounted mine under my gunwales using the adhesive tape backing and a cable tie mount every few feet. Holds well but hard to tell if it will work for your situation without seeing pics of the boat. I leave mine on the red setting because it apparently doesn't impact your night vision the way other colors can. https://www.amazon.com/gp/aw/d/B003L16ZYU/ref=mp_s_a_1_3?ie=UTF8&qid=1498686335&sr=8-3&pi=AC_SX236_SY340_QL65&keywords=cable+tie+mount&dpPl=1&dpID=31jbcFP3ezL&ref=plSrch

In regards to your cable question on Imgur,

Ikea Signum if you can fit it. Put the power strip and all of the cables in it and the only wire that will be visible under the desk is the power strip to the outlet.

For the monitor cables, you can get some adhesive zip tie downs and stick them on the back of the monitors to run the cables to the center monitor and then run those down the back of the mounting arm.

• Cable management cord tube, use scissors to cut it into multiple parts.
  
  
• Get a new surge protector, something like this. It will sit flat and you now can plug everything into it.
  
  
• Want to get super cable management happy? Buy a bucket of cable tie mounts. After you have consoles and other devices in place figure out the best way to run the cables along the back between them then stick some cable tie mounts down and use a releasable cable tie, don't use standard cable ties unless you are going to leave some slack for cutting easier later without risking damage to your cords
  
  
• You're already using one CD portfolio holder, why not get another large one and dedicate it entirely to games. If you do that and put the empty cases away in a box you could then put other things on the upper shelf like controllers
  
  

If adhesive works for you I really like these: https://www.amazon.com/gp/aw/d/B003L16ZYU/ref=mp_s_a_1_1?ie=UTF8&qid=1505748446&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=adhesive+cable+tie+mount&dpPl=1&dpID=31jbcFP3ezL&ref=plSrch

You'd need some zip ties as well: https://www.amazon.com/gp/aw/d/B017B6CMQK/ref=mp_s_a_1_2?ie=UTF8&qid=1505748615&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=cable+ties+4+inch&dpPl=1&dpID=51VaNw6mvxL&ref=plSrch

Quick and dirty way would be to take excess cabling and just tape it to the back of that wood. The better way to do it though is to buy those adhesive tie down points to route your cables.

Something like this.

http://www.amazon.com/Monoprice-Cable-mounts-25x25-100pcs/dp/B003L16ZYU/ref=sr_1_2?ie=UTF8&qid=1451691042&sr=8-2&keywords=adhesive+tie+mounts

These are kind of similar, its what I use for alot of stuff http://www.amazon.com/Monoprice-Cable-mounts-25x25-100pcs/dp/B003L16ZYU/ref=sr_1_5?ie=UTF8&qid=1458821693&sr=8-5&keywords=adhesive+cable+clips. You can use zip ties around them so you can make nice bundles and what not.

Monoprice Cable tie mounts 25x25(mm), 100pcs/Pack - white https://www.amazon.ca/dp/B003L16ZYU/ref=cm_sw_r_cp_apa_i_i4D2CbK6NS0EC

VIVO Dual LCD LED Monitor Desk... https://www.amazon.ca/dp/B009S750LA?ref=ppx_pop_mob_ap_share

Never mind, found them:

Monoprice Cable tie mounts 25x25(mm), 100pcs/Pack - white https://www.amazon.com/dp/B003L16ZYU/ref=cm_sw_r_other_awd_19P2wbT100EJX

Underneath my desk i have 2 ikea signums holding all my cables, and if i need to route the cables somewhere specific like behind my monitor I use some sort of zip tie mounting plate together with zip tie's of course! Just take your time and route the cables however you like them.
zip tie mounting plate: http://www.amazon.com/Monoprice-Cable-mounts-25x25-100pcs/dp/B003L16ZYU/ref=sr_1_1?ie=UTF8&qid=1457803967&sr=8-1&keywords=zip+tie+mount
ikea signum: http://www.ikea.com/nl/nl/catalog/products/30200253/
hope it helps :)

Completely unsolicited suggestion - Cable tie mounts to route the wires.

https://www.amazon.com/dp/B003L16ZYU/

You sticky these where you want to run the wires, then you zip-tie the wires to the mounts, then cut off the zip ties tails.

Your lack of cable management is murdering my insides.

Here. Please get some of these and make your shit pretty.

https://www.amazon.com/Monoprice-Cable-mounts-25x25-100pcs/dp/B003L16ZYU/ref=sr_1_1?ie=UTF8&qid=1474305690&sr=8-1&keywords=zip+tie+mount