Salute!
From the "lite" peanut gallery........
Slats seemed to be like those on the F-100. They didn't pop out until the AoA was above "x". Or were manually controlled.
Slots were permanently out there, or extended with gear/flaps down. Some really old planes had those like the Stinson and others. Possibly some of the ME-109 variants.
Then we had basic leading edge flaps like the A-7 and F-16 had. The A-7 ones came down with teh flaps. The Viper ones worked full time acoording to AoA and mach, but were fixed down at "x" degrees when gear handle was lowered.