SLC website has very little information about its airport regarding connection...

so i have a few questions about International to Domestic connection at SLC:

1. Flying AMS-SLC on KL business class on an award ticket, SLC -> Los Angeles area on DL economy (or perhaps C+) on a paid ticket. I am doing two separate reservation because of the lack of award availability on KL non-stop from AMS->LAX. Will KL agent be able to check my luggage through from AMS to Los Angeles area airport even these flights are two separate bookings??

2. Will KL agent at AMS check me in for both flights in two reservations?

3. Will I have to leave the security area after clearing US Immigration and go through security again (I have Global entry)? From what I've read, it seems like all gates / terminals are connected via walkway at airside....

4. I know MCT is 1 hour for I->D connection, but should I allow two hours (2:50 arrival from AMS, perhaps 5pm-ish departure to Los Angeles area) just in case the immigration takes longer than expected? from what I've read, SLC immigration lines are not that long, but you never know.