I have a Chitu one (from Amazon) on my M3, well, two actually, I bought a second build plate as well. They work great, but yes, I did need to print a spacer, 2.5mm I think it was.

Here's the one I bought: https://www.amazon.com/gp/product/B0BJF5KMXX

I have this one on 2 different machines for over 8 months now. (M3 and Mars 3 Pro)https://www.amazon.com/gp/product/B0BJF5KMXX/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Not sure on Max build plate size.

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Works well for me now it states you will need a spacer and yes you will probably want one.

Here is where I get in trouble I have not put a spacer on my machines because the heads all have more than 2.7mm of travel when fully loosened. So my thought and I know this will start a shite storm is if the head can move up and down more than the flex plate thickness and you make sure you have it as loose as you can when leveling it it will still level out fine and put no more pressure on the screen than a normal leveling process with out the plate will.

What I will say is if you immerse your plate in IPA to clean on the entire build plate it will/might break down the adhesive over time. Not sure if you hand clean your build plate since I am too lazy to do that. I have had to replace one magnetic part in 8 months not sure if it was the IPA or a bad install, it failed after 3 months but the other is still going strong with no need to replace the magnetic part.