The first option is to use the same system you used in the store... Or one along its line. What was it? If we know what you liked we can be of further help
Good question! I never got a chance to try for myself and to look. The dealer showed it for me with his own guitar, his PEAK controller and some amps which he used himself. I only know he used just a single small cabinet with one speaker. So I called him to find out...: In the store he used a single 112 Jackson Ampworks cabinet.
Since I have a Marshall VS 212 and a Line 6 stereo and mono 412 cab (320 W) I thought I should be able to get some sound from either one too. But this not my concern for now.
Explaining of the Kemper by the dealer was not an issue. Indeed he showed me some things but he was technically also way ahead of me because he uses this Kemper quite often for doing gigs. So I figured out: How difficult can it get trying this myself at home?
Maybe I have been too optimistic about that....