Here is a GPU clip for hanging on shelving units. No more needing zip-ties It can hold most 2 slot GPUs. This is for the community FREE of charge.

You will just need a screw for holding the GPU in place. Best shelves to use are the HDX ones from HomeDepot: https://www.homedepot.com/p/HDX-Chrome-4-Tier-Metal-Wire-Shelving-Unit-36-in-W-x-54-in-H-x-14-in-D-EH-WSTHDUS-004/204466874

or the Amazon Basics one: https://www.amazon.com/dp/B071DZHMVN/ref=cm_sw_r_cp_api_glt_fabc_1B3RXHN8ZKJGVZB2C5T0?psc=1 or https://www.amazon.com/Simple-Deluxe-HKSHLF29146105G-5-Shelf-Shelving/dp/B07R9MQMSP

-Open Source Advocate