I have my Rosewill 4000 series sitting on a pair of StarTech shelf rails.
https://www.amazon.com/StarTech-com-Server-Rails-Adjustable-Mounting/dp/B083N35SCZ
You loose the slid out ability but you're not having to deal with the headache of sliding rails.
That there were also $CA35 cheaper than the Startech sliding rails also appealed to my occasionally parsimonious nature.
I had some old Chembro rails before hand and they were just as big a pain.
I have my Rosewill 4000 series sitting on a pair of StarTech shelf rails.
https://www.amazon.com/StarTech-com-Server-Rails-Adjustable-Mounting/dp/B083N35SCZ
You loose the slid out ability but you're not having to deal with the headache of sliding rails.
That there were also $CA35 cheaper than the Startech sliding rails also appealed to my occasionally parsimonious nature.
I had some old Chembro rails before hand and they were just as big a pain.