Anyone got any recommendations or warnings on gutter guards? Gutters on the front of my house stay pretty clear, but I've got several trees in back that drop all sorts of crap in, end up having to clean them way too often or deal with overflowing during a storm.

I was considering the simple foam ones that go inside the gutter, but seems like it would need to be replaced every couple years. Also saw something showing that most of that style are pretty flammable, which seems like a bad idea.

I'm looking at something simple like:
https://www.lowes.com/pd/InvisaFlow-...Guard/50031816