For the Pilot Panel screen in front I just bought a matte laptop screen protector and cut it to size. It's not perfectly fitted but good enough for now and the matte really helps with glare.
The only screen protector I have is a hard matte one for the lower pilot panel. The matte finish really minimizes fingerprints and glare, neither of which is an issue for the upper Clearview cockpit. I do recommend a matte protector for this lower screen since it's typically touched more and can have a bad glare seemingly quite often. While I have a hard one, a soft one should work too. The screen is 12.6inch and 9:16 (standard widescreen). I ended up getting this one for myself. It's actually only 12.5in so it's about 1mm smaller on all sides than the illuminated screen, but it doesn't look that bad. The screen protector itself is really nice, but now not sure worth the $50 I spent. Honestly though, there's enough non-illuminated bevel around the display that I think a 13in 9:16 screen protector would fit perfectly with the edges somewhere in the middle of the bevel.
I'd actually recommend anyone looking for one to get a 13in 9:16 hard matte screen protector for the pilot panel only.