I had a 10 by 5 layout. I used all Atlas track and switches without much problem. I had pink foam board glued on top of 3/4 hardboard. I painted the pink foam with ground color latex paint (make sure to remove the clear plastic sheet from the foam before painting). I then put the Atlas track down on the painted foam board. I did not screw the track down and never had a problem with it moving around. Once you have a significant amount of track down, the combined weight holds it down just fine. Also, if you end up gluing in ballast, that will hold the track down even more.
Also, I tried to introduce a GarGraves Gantry track into my Atlas track layout and found that the large difference in the size of the ties was visually unappealing. I believe that Ross has similar sized ties to GarGraves. So, I would suggest that you compare a couple of pieces side-by-side before buying a bunch from one vendor or another. Ross mixed in with Atlas may not satisfy what you are looking for....
