Radar Installation

[regulator23]

I am planning on installing a radar unit on my 23' Regulator hard t-top. I am likely going to go with the new broadband model BR24 (Simrad, Lowrance) which is a closed (versus open array) type unit. My question is around the degree of tilt this thing should have. It seems that a t-top will have different angles based on whether or not the boat is sitting, trolling, running slow, or running fast. Is there a standard that I should use? Seaview makes standard mounts that are either aft leaning or forward leaning at 20 degrees. They also make wedges that are either 2 or 4 degrees. Since this is the first radar for me, I need some help in determing the best way to do this and any and all thoughts are welcome.

Thanks.