Well one can roll the dice buck the advise of the manufacturer (who designed, manufactured it and most likely knows a lot more about how it reacts than any arm chair Internet Keyboardist would know) and see if your experiment fails or succeeds.
I would bet that most likely it will ultimately fail in utter disaster with your glued down flooring buckling after some time passes.
If it doesn't buckle, you are most likely are going to deal with damage from the slide moving back and forth over it ANYWAYS.. Many folks who installed wood flooring under the slide area end up with the slide dragging on the flooring causing gouges in the newly minted flooring. Even "engineered" flooring will be thicker than carpet and will not give like carpet.
My best advice would be to lay CARPET under the area that the slide will go over when in.. Then lay your flooring around the carpet and frame with some trim work on the floor.. Or if very careful you cut the padding short of the edge of the carpet then fold carpet under then you can use a few hundred staples through the carpet to tack it down, then lay your wood flooring around the carpet.
Don't like carpet at the slide? Then get some vinyl flooring and put down in the area the slide will move over. Check with a few flooring shops to see if they have some discontinued vinyl floor or perhaps some leftover scraps from installs that may be large enough..
Oh, by the way, "engineered wood flooring" is another term for leftover wood and paper scraps mixed in a bunch of glue compressed under high pressure and if you are lucky a thin wood veneer is glued to the top.. Pretty much a MDF (Medium Density Fiber) panel board material.. It WILL absorb water and it WILL EXPAND, not so much with contracting once it expands even if the moisture has been removed.
You are buying expensive junk.
Weighs a ton also..
I would never consider putting a wood floor (including "engineered artificial fake wood flooring") into a RV, RVs experience huge changes in temperature and humidity. Yes, there are folks who have done it and been successful but more likely more failures have happened..
Go with vinyl or carpet, much more forgiving in the RV environment, I used peal and stick squares in my RV, quick and easy and if one gets damaged, pull up the damaged tile and drop a replacement tile in..