Does it need to be a HPWC? No matter what you decide on, the limiting factor is your on-board charger.
If you are budget constrained, you could just use your UMC connected to a suitably powered socket.
You haven't mentioned which model Tesla you have so for single charger MS/MS (pre-Raven) get the sparky to install a 20A 3phase switched socket then use your Gen1UMC with a
Tesla Euro-adaptor and 20A tail to get 11kW.
For Model3 install a 32A single phase switched socket and use your Gen2 UMC with
CEE adaptor & 32A plug to get 7kW.
The only exception is MS/MX Raven owners who have 17kW on-board charger, their Gen2 UMC would only deliver 7kW, so a HPWC would be the go-to solution or a
3rd party 22kW wall-mounted EVSE with a Type2 connector.