I used the "sit on a table" method for setting my cleats when I first started using them.
What became apparent in practice though was that my feet weren't identical, as my left foot felt 100% ok, but my right foot developed a hotspot. Through a lot of experimental tweaking I found that my ideal was for the cleat position on the right foot to be set half a centimetre further towards the heel than the left foot.
So from my perspective using electronic wizardry in your LBS may be ok as a starting point, but to get the perfect position you still need to listen to what your feet are telling you and not be afraid to do a bit of manual tweaking.