The ERSA is a great tool used by Intel for R&D fpga placement it cost 50000Euro so youcan see the
balls  so you get theheight of the chip as part of the profile

I invested in a bga-100 inspection scope to inpect the smt soldering  I got in a Ebay for $600
http://www.smttools.com/bga100.html   as can be seen below I can inspect also QFP and diffrent
soldering quality