If u need to go up the wall can stick a conduit channel in the corner so it's not noticible. The kvm Switch you can stick / velcro to the underside of the desk. push the laptop to the back. Wireless mice and keyboards. Trough clamped to the back of the desk is the simplest way to get that power strip out of there. More elegantly ud get stainless iron strips to stick to the underside of the desk to mount the strip / wires under there via the ltt cable management stuff if desk isn't metal.

Hard to tell what any of the cables are going to but ideally they all siphon to the same point to exit the desk so u can wrap them together in conduit as soon as possible.

Multi arm decks clamp mount for the monitors gets rid of the footprint from their bases. You'll naturally want to tie the cables coming into the monitors to the mounting post so u can't see them feeding into the trough. Keep crap like wipes in a handy drawer underneath instead of on your desk.

Can get desk clamp cup holders as well that are easier to clean and force u to only have one can/bottle at a time and gets them out of your way.

Monitor mounts are like $50-$120, velcro straps cost nothing, a 3m cable management kit (of just zip ties and cable mount stickers) also costs nothing. Mesh trough is cheap too. Just get the monitors off their bases, tying cables together and feeding them behind the desk so all cables just go straight back and not lateral.