Unless your gophers are the size of beavers, this will not keep them out. I use hardware cloth as a rodent barrier for our trees, flowers and vegetables.
Sorry, I meant how deep - from ground to the top. Is this for a gravel driveway?
It would be good for this application
This one is lot thinker.. more heavy-duty for retaining wall application. This can be used for paver too, but itthis is a lot more stiffer
Yes, and/or on top.
This product is buried under about 20 tons of crushed granite. It has stopped erosion and made the driveway more solid. This is made by the Tensar company. I recommend checking their website for engineering specs. They had a lot of documentation available and it was extremely helpful. https://www.tensarcorp.com/Systems-and-Products/Tensar-Triax-geogrid
Yes but the rocks have to pounded to the ground firmly before using the TriAx and the sand
A question like yours would be better answered by the manufacturer than someone who bought it from HD. I would hate for someone to tell you "Yes, it works" and it doesn't and then you have problems down the road. We used ours on a driveway to help hold the crushed granite in place better. I recommend going to the "Applications" page on the manufacturer's site. https://www.tensarcorp.com/Applications
I would recommend going to the manufacturer's web site and looking at the "applications" page and see what they suggest. I would hate to tell you it works and have you do all the work and it fails. Often times it all depends on the quality of the workman doing the job. https://www.tensarcorp.com/Applications
EarthLock Jobsite Grid.