Hey xmagic is a great choice. Here is a good thing to consider. place something on the spot you want your implant to sit. then go up to objects and try to touch that something to the object. If it feels unnatural consider a different placement.
I have found that P0 on my right and left hand is good for scanning with my phone to write and rewrite but i found it an awkward position to try to present to readers or access contro, devices.
Conversely it seems that P3 seemed to be the most natural for me. So i went with P3 on my left hand. I find i can present it to the door reader and card reader most naturally. and knowing the range isnt amazing it makes it easier doing the implant coupling dance to find the sweetspot.