Question regarding multiplexing NFC antenna to PN532 chip. Is such a scheme viable?

I have a requirement to read data from tags in a grid of squares 2 1/4" x 2 1/4" The grid can be 4x6, 4x8, 6x6, etc. The reading distance needs to be about 1.5" in diameter extending about 1/4" from the antenna. The tags will be separated from the antenna by a sheet of glass (or other non-conducting element). Is it possible to simply wire up an antenna in each grid square, have the connections go through multiplexers feeding to a PN532 chip so that each of the tags can be read? If such a scheme is possible, can anyone tell me:

1) If the antenna circuit would just need to be simple wire or do I have to setup separate inductors/capacitors and tune each antenna?
2) Will the length of the leads to the antenna from the chipset/tuning circuit have an impact on the performance?
3) How fast can such a switching antenna sample the tag values at each grid? Are we talking a few samples/second or can I read say for a grid of 6x6 tags, the 36 tags several hundred times per second?

I realize this is a strange/non-standard application but I'm coming up blank so far.