Hello! We are a house of worship and need to install a wireless microphone system. At this time we have two Shure wireless mics/receivers that we want to retire and two newer Sennheiser systems. I've heard about rackmountable systems that will accommodate up to 20 wireless handhelds but cannot seem to find much information or pricing on them. At this point we want to purchase and install four new microphones, but would possibly adding another four in the near future. So, if possible, we'd like to have one receiver that handles all of the mics, up to 10. This would exclude the two Sennheisers, but that is acceptable. Any thoughts? Thanks!