I have been using this 3U Shallow Rack from Thomann for a few years now both in the studio and live. It's open backed but obviously, being 3U, there's no space above or below. Prior to getting this I had the Kemper in a much larger rack but again, no space.
In my home studio my Audio Interface and a Rack Tuner sit in a similar, 2U, rack and I just drop the Kemper on top. Live I've started using a Quiklok 2 tier amp stand with the Kemper (plus a TC VoiceLive) on the upper deck and an Alto TS210 as my 'backline'