Yes both Alozzy and I ordered directly from China, from the manufacturer. I believe he went with the 14-50 plug while I chose the L6-30 for portability. The EVSE doesn't come with any outlet adapters nor does the seller sell any. I and I believe Alozzy made our outlet adapters. Other than portability the reason I chose the L6-30 standard is female plugs are cheaper and easier to fine. I've made many different outlet adapters, anything from a standard 120v household outlet(NEMA 5-15) to TT30(120v RV outlet) to several of the different "L" or locking outlets to 6-15(240v AC outlet) to 6-30 to 10-30 and 10-50.
To make the outlet adapters I simply need a L6-30r(female plug) to plug into my EVSE's L6-30p(male plug) along with a 6" or so piece of 10-3 wire and finally the male plug I want to plug into. Unfortunately there are lots of different kinds of 120v and 240v plugs but I picked the most common ones I've run into. To build a converter plug it costs roughly $10 for the L6-30r, the wire is ~$1 and various plugs are anywhere from a couple of dollars to maybe max $15, they take about 15 min to 1/2hr to make. You can purchase premade(or ones someone has made) converter plugs but they tend to be ~$50 each. Note when purchasing a premade 120v to 240v converter plug it needs to be wired for EVSE use, a RV adapter plug will NOT work as they are wired differently. It won't blow anything up, it just won't work.
The Juicebox is nice and lets you set any current you want(I have an older one) the Zencar EVSE only lets you chose 3 or 4 preset currents. Personally I think the best choice is 13a(for 15a outlets) 20a(for short term 20a outlet use) 24a(for 30a outlet use) and finally 30a(for short term 30a outlet use or long term use on a 40a or greater outlet). Note our Leafs max out at 27.5a so even using the 30a setting the EVSE will only output 27.5a max(still a bit high for long term 30a outlet use). Of course you can choose any 4 amperages you want, I believe all are even except the 13a setting.
Here's a link to a nice sketch of the various NEMA outlets(about 1 page down on the right side)https://en.wikipedia.org/wiki/NEMA_connector
And heres a link to a similar EVSE from Amazon, about $100 more but goes up to 40a(if you had a EV that would go that high, our Leafs max out at 27.5a).https://www.amazon.com/dp/B071GM7GQZ/_e ... FVDA67L13W
My Zencar EVSE is the only one I use in my Leaf, with it I can plug into just about any outlet I run across and am able to charge at the highest current possible. I use my Juicebox at home, it needs WiFi and an internet connection to be able to adjust the output amperage, something you may not always have access to out and about.