Do any of you guys or gals have any experience with the Lone Wolf footrest for the Lone Wolf Stands?

I've had some back problems this summer and am still pretty sore at times from it, and I cannot seem to sit in my Alpha hang on for more than an hour or two before I start hurting. Does the footrest take any pressure off of your lower back or rear end or is it just for the back of your legs.

Also, it looks like you have to drill a couple holes to mount them?

Are they adjustable or stationary?

Thanks for any help you can give me.