While our Karma's can only charge at 3.3Kw, and therefore only need a 16A charger, I strongly recommend you get a 30A or 40A charger at a minimum to future-proof yourself somewhat or in case any other EV may need to charge there. The higher amp models work just fine for the Karma but can charge other EVs much more quickly (the Karma too if you opt for PowerSources charging mod). I have two EVSE's, the original 16A Fisker-branded Lear and a Clipper Creek HCS-40. I'm a big fan of the CC. It's bulletproof.
We installed a 14-50 outlet and use this same EVSE on 110 and 240 by just changing out the twist lock adapter. You are better off having your electrician just install the outlet rather than doing a fixed permanent install. This way you can upgrade your EVSE in the future by yourself (by just unplugging it and plugging the new one in).
TurboCord AV Solutions works great on my Fisker. 4.5-5hrs 0-50 mile charge. $499-240V
$ 599 120-and 240V. Amazon. Best thing I have found in addition to fast charging is size, no larger than convenience charger allowing you to take with you if have access to 240V at destination. ss89