Nice idea about track mounts, but it gave me a better idea for one. (the price is a killer) http://www.gardenrailsystem.com/
I used split brick throughout my layout. On 5 foot long straight track pieces, I put one at each end and one in the middle. Shorter track just has a brick at each end. I don’t know if split brick are available everywhere, but here in Arizona they are sold at Home Depot. They are basically a normal size brick cut into half thickness. before baking. I was able to use them on my entire layout for less than the cost of two of those Fleximount devices.
cacole
If they don’t have a split brick then you can split the brick.
When I lay Pave Stones (R, TM) some need to be split. When we do split them they split clean, very clean split.