I have the same sling mount from Mesa but I mounted mine on the opposite site of the tavor. On the ejection port side. I find this more comfortable when hanging as it pulls the butt into your chest and when shooting the sling isn't caught between your shoulder and the butt if the rifle.
I came across a good article in Canadian Firearms Journal that had a good option for a sling mount. Its a Mesa Tactical receiver mount for a 870, it's suppose to be a perfect fit for the rear sling mount on the Tavor.
http://www.gptactical.com/en/products/shotgun-accessories/p17694493.html



























