Not a problem at all
( The only consideration is a multiclass reader, that is “looking” for HF and/or LF, but this rare and there are mitigations you can use)
It has been suggested to keep them >50mm apart
I would add though, this recommendation was given before the G3 V2 was available.
So with the 2 different magnetic pole Axis options, that would determine in what direction from your other implant you would want to consider.