Your question implied that you were getting ready for your BAM opener, which further implies BAM/TSO rulings on setup, formations and, I assumed, eligibility to receive a toss or pitch.

As far as BAM/TSO formations/restrictions/limitations go, which was your original question, it looks like Mozeek answered it. I am not qualified to speak for leagues outside of my own, so asking for my advice on BAM/TSO Rules is why I refrained from answering. Not my show.

But, from an NFL standpoint (NCAA, etc) there are are only 2 setup restrictions: 7 men on the LOS for Offense and both teams lining up Onside. Everything goes in real life. Each MF league and/or Coach creates their own set of limits based on their individual interpretation of the real game, which translates into 500+ different ways of doing any one thing!?!