That sounds terrible.
Maybe it just reminds me of the old switches you could put in-line to a lamp cord that bites into the insulation, I’ve had more than one of those burn to a crisp unexpectedly. And you’re going to potentially run up to 15 or so amps through that?
I won’t use the push in connections either, always screws, and I always pigtail to downstream connection rather than using the outlet as the connection. I guess I like extra work. And also a bit of extra robustness and servicability.