If you analyse your tracks in Rekordbox (and use them with SD card/USB) if Quantize is 'ON' then the loops will be quantized. No need for a laptop, you just need the tracks to be analyzed in rekordbox - the software grids the tracks which enables things to be quantized.
I know that when you hit the loop cutter button, it is not quantized, but it will create a quantized loop. So, in my experience, you just have to hit the cut button with perfect timing to cut the loop down and keep on the beat. It's not that hard, I've learned to do it.