I have several pair of monoblock amps that sit on amp stands on the floor. I find better sound if I use the Star Sound SP 004 Sistrum Platforms, or have Valleyplastic (audiogon member) make you a pair of monoblock stands out of 1" thick Acrylic all CNC finished and highly polished (in black or clear), and include spikes.
See: http://cgi.audiogon.com/cgi-bin/cl.pl?accsrack&1216588272
See: http://cgi.audiogon.com/cgi-bin/cl.pl?accsrack&1216588272