Hi MSTV, to better assist you with your wall mount, please contact us and we will gladly help you with this matter. Viri E. Rocketfish Support. https://www.rocketfishproducts.com/contact-us
You can slide it on the bracket left and right with some effort (I would recommend 2 people) and after loosening the clip screws but in terms of easily accessible swivel...that is only up an down.
I went to Home depot and inquired in the Hardware - Nut & Bolts area to get Bolts that were long enough and would bear the weight. The TV I mounted was heavy. I purchased four 2 3/4 inch bolts for the Bracket. I drilled a smaller diameter hold and then put in the Bolts.