Reddit mentions of Amarine Made Pair Stainless Steel Solid Shelf Brackets,8",10",12", Shelf Support Corner Brace Joint Right Angle Bracket (12"X6-1/2")

I agree with the others. It's completely possible to not do it, but this is a long table top that needs support in the middle. Consider some standard shelf wall mount brackets to support the middle of the table if that's any better for you. Even with something like this screwed to the wall and to the desk, I wouldn't stand on it.

I would have done something with a shelf brace and some command strips. If you placed 2-3 strips on the side on the wall and then you could use zip ties to strap it to the brace. Or just drill in there wall and patch it up, I've put tons of holes with out thinking in my apt knowing I can path them when I move.

Amarine-made Pair Stainless Steel Solid Shelf Brackets ,8" ,10" ,12" , Shelf Support Corner Brace Joint Right Angle Bracket (12"X6-1/2") https://www.amazon.com/dp/B017GS6GUQ/ref=cm_sw_r_cp_api_tMUExbE01DPNX

Command Large Picture-Hanging Strips, Black, 4-Strip https://www.amazon.com/dp/B00404YO1I/ref=cm_sw_r_cp_api_eOUExb9GBHEW5

Also to clean it up a bit:
Wiremold CMK50 Cord Mate II Kit https://www.amazon.com/dp/B0015EDVVU/ref=cm_sw_r_cp_api_CSUExbRZ17VST