i recommend attaching a PDU underneath the standing desk and using basic cable management clips/zip ties to run all of your hardware plugs into that. then all you're left with is the single pdu cord to plug into a surge protector (or in my set up, I run into a battery backup UPS)

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you can still tie that single pdu cable down, making sure you have enough slack for when you use the standing desk at max height. I have a few more cables running down with the PDU so I use one of these tubes to conceal them all.

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here's some pics of my setup https://imgur.com/a/31eAxvQ