I've been really disappointed with the Cannakit power adapters which came bundled with my 3b+ units (four, total). They are definitely not able to deliver enough power
to even a dongle-less Raspberry – not sure why they were paired together.
All have been replaced with beefier AC/DC bricks. Definitely thanks for the consideration and model reqs.
My own recommendation is to use a powered USB hub, immediately plugged into any Pi (so the Pi's adapter can just worry about powering only CPU board).