Just to provide a concrete example:
http://www.jellyinajar.com/2012-03-04NewCenturyChamberOrchestra1stSet_sample.wav(24 bit, 44.1k, large .wav file 48.8mb 4 min sample)
recorded 5Te41Th, exact center first row, mics were at a height maybe a foot above the floor of the stage. in other words the floor of the stage was about at my neck level and the mics were about 4 inches higher than my ears
I would have preferred to get my mics higher but had zero flexibility in positioning - had to record from my seat. I have had virtually no experience recording classical music. But from what I'd read six feet behind conductor eight feet high is ideal or hung from above, which I understand you can't do for your situation.
decent gear: Beyerdynamic CK930s > Naiant Tinybox > Sony PCM-M10
guess this proves it can be done. the night before recorded same orchestra with same gear from first row close to center but in a church (musicians love) but I found far too echo-ey
hope this helps.