I'm thinking I will get some baffles and cut the bottoms off to use as rain guards for my new front comps. Any suggestions on the best ones to use & where to buy?

I am picking up the morel tempo ultra 602's and I am not yet sure if the mounting depth will be an issue with the magnet on the window when it's down. Should I be using some rings/spacers regardless? I heard HDP that kitchen cutting board material is the best. Anyone know where I can go for something that is pre-made?