I also have used the Herron Amps stacked using just the standard feet. It didn't really cause any issues.
Herron VTSP3 pre-amp with what stereo poweramp
Considering trying separates and have an interest in Herron pre-amp , however, I can't go with mono blocks- any suggestions from those who are familiar with Herron - saw in one virtual system Classe.My speakers are JM Reynaud Offrande Supremes, Blue Circle 509 DAC ,Stello CDT100 Transport; Blue Circle BC6000 power conditioner - thanks