If you want to use sfizz for drums, here's a kit that I put together from the tchackpoum samples:
https://github.com/michaelwillis/tchimera-drum-kit
In Ardour, make a midi track, you can call it "percussion". Then make five midi busses: kick, snare, toms, hihat, overhead. Route the track to all of the busses, make each bus run its own instance of sfizz, and load the corresponding sfz file into each sfizz instance. This will allow you to mix them differently (for example, you want more sizzle on the hihat or more snap to the snare). Have fun.
Edit: Please note that http://tchackpoum.fr/ has lots of samples. I used mostly different ones than @JamesPeters used in his Tchackpoum Kit for DrumGizmo, so these two kits sound quite different.
Edit again: sfizz-multi is now supported, and the readme explains how to use it. Also renamed to Tchimera Drum Kit