For that width fender you're going to want to stick with aluminum as plastic will be extremely floppy. Velo Orange makes the best fenders that balance quality with cost. I've used two different sets for a few thousand miles of gravel and occasional singletrack riding (in addition to road) and haven't had any complaints. They work well.
https://velo-orange.com/collections/fenders
I run 52mm fenders with my 650bx47, they work for me but really the fender should be 10mm wider than the tire for best coverage.