Yes. The Midwest Industries Combat Rifle Sight Set, when flipped up, sit at the Mil-spec height of 1.4". This will allow you to see these sights within the lower 1/3 of the window on your EXPS-2.
These sights will work on your pc charger although they may be a little high, I would suggest Troy Micro sights that I have linked below.
https://www.opticsplanet.com/troy-micro-m4-front-doa-rear-folding-sight.html
Code:OY-IRN-M4FRSTS-SSIG-MCM-SSBT-00
The rear sight measures .388in centerline when folded down.
Yes these sights will work well on your Smith and Wesson M&P 10.
Yes this uses standard A2 front sight post.
These sights should work with most optics due to the mil-spec height, and that they fold down for storage.
It will cover approximately 2.5" of rail space when stowed.
Yes, they are standard AR-15 iron sights and will work on ANY AR platform and any red dot that is set at either an absolute or lower 1/3rd co-witness height.
A solid impact in the right place could close them (this is true for most flip up sights), but it is unlikely that they will flip down by accident.
Base to bottom or the aperture is approximately 1.31".