Most projector mounts, even decent ones, only allow for pitch and roll although all mounts at least allow you to re-attach the projector to the mount for a little bit of flexibilty. Some high end mounts get really fancy but I doubt you want to drop a couple benjamins on a mount for a sub $1k projector.
I use the stock BenQ mount for my 2050. Nice looking and cheap but zero horizontal shift. I just measured carefully. If I was off by too much my silver ticket screen is easy to slide left and right on it's rails. As it turns out I was off by an inch or so, maybe less, according to my laser pointer. It's impossible to tell. If I hadn't had the laser pointer I'd swear I hit it precisely.
What to do if you find yourself stuck with no hope of rescue:
Consider yourself lucky that life has been good to you so far. Alternatively, if life hasn't been good to you so far, which given your present circumstances seems to be more likely, consider yourself lucky that it won't be troubling you much longer...
-- Excerpt from the Hitchhiker's Guide to the Galaxy.