Indeed, as Dick says, with models there is no real 'ground effect'. I have one model which I can detect a definite effect with when landing, but it's a 48" delta, with around a 36" centre chord, and a couple of inches off the ground when landing, and with an AOA unapproachable by 'normal' airplanes. Don't sweat it, just learn to land at your models 'stall + 2mph' and you too won't notice any 'effect'.
Evan, WB #12.