Keep light equipment from tipping up from cable weight?

Fatten the plug with self fusing silicone tape. It gives a grip effect similar to the Shunyata plug shims that come with their cables.

https://www.amazon.com/Nashua-1541204-Stretch-Self-Fusing-Silicone/dp/B089B7NKVK/ref=sr_1_4?crid=2TJQKWYNVRWGZ&dib=eyJ2IjoiMSJ9.UQEEzEo7eR-hTmZk87mQEr2riZMukD38qu-sOsH_4CF_WzyUjrgMPL6BrOHsQN2Kx2uvNrt4glSIe1i4_RsCI5BWPBErml1YZSdVAN6Y7fmVvOHxybzgEphhVfiABXB8fYIw3csQAp2k9EOIDbJqVkgfuInVTj6Kk1RnzwbaiPOtaIDU-TvEY1-zOr5h3HKcZAXTt6ZsuAssAJ5DBeAA6aQPPxMwqbUBO_Xj1oeXsWI.lghZFehL48RDCVtKzONvEC_YR3F00INmUsgG1gSAtig&dib_tag=se&keywords=self+fusing+silicone+tape&qid=1721921004&sprefix=self%3Dfusing+silicone%2Caps%2C116&sr=8-4

Blue tack on the feet of your light equipment. Available at any hardware store and most groceries. 

I had a very light component in my system once and built a support structure for the cable out of, of all things, Tinker Toys.  I know it sounds bizarre but it did the job!

Double-faced tape on the feet, zip ties (in a range of 'attractive colors'....

I've a couple of items that suffer from the noted, but have been able to tuck them under or behind cables that keep them stable...

...and there's always Blu-Tak....

Gift wrap a brick....

I just put a box of ammo on top.  Heavy and dense, they keep everything in it's place.