(DG) Axiom transducer selection

I have an axiom 9 rv. I am looking at the pair of plastic thru hull transducers. My boat is a bayliner 2859. Specs say it has a 15degree deadrise. As i look at different sites to purchase they show the 1 to 12 degree and 13 to 20 degree choices. But on the raymarine site it says to choose the ones that are within + or - 6 degrees. So it looks like either set will work??? I want to be sure before purchasing.

What do you recommend?

Thanks for your time!