Additional isolation for Preamp/ components

I have a Rix Rax hoodoo (4 shelf) rack with another 2-shelf
version curently being made by Rick. I dont believe there to be any exact science behind these racks, but they are certainly rigid and structurally sound. I have only 8" between sheves on the hoodoo and will have 9" on the smaller rack I am awaiting. I dont have alot of play as far as the height of an aftermarket ball-bearing type, or point/cone type foot.I will have to look for something around 1" in height. With all that said, I am wondering if anyone might suggest an isolation product to couple my linestage, phono stage , and maybe even my AA Capitole 2. The AA will sit atop of my new rack when it arrives, with the other components on the lower shelves. Thanks in advance.