Followed the key word “MotorolaG52” here in the forum and found a comment from myself (I have a G32, though), specifying some stuff that I had since then forgotten about 
What were your difficulties with the Moto G7?
For the G52: You plan to buy it new and then unlock it and flash iodéOS onto it? That should be quite simple to do. If you already have some other custom ROM installed, then going back to manufacturer’s OS first, then flashing iodéOS might be better.