Holy cow, NO! I see a number of problems with this device. The main ones being:
1 - It claims to provide 240v 20 amp service. That means it needs to draw 20 amps from each of two 120 v plugs. That's 40 amps of power at 120v to produce 20 amps of 240v power. If you plug it into two outlets that are on the same circuit breaker, you are going to just pop that breaker. You are in the USA which means you likely do not have a 120v 40 amp circuit in your garage. I don't even know if such a thing exists.
2 - That means the two plugs must be on separate circuits in your garage. How many garages have two different circuits in them, nevermind two 20 amp circuits that have NOTHING else on them. If there are other draws, that will cause each to pop when you pull 20 amps from them on a 20 amp breaker. IF you even have 20 amp circuits to begin with.
3 - 20 amp breakers are not meant to have 20 amps of continuous power sucked through them. Gosh knows what would happen if they were to not pop, would they or the wiring start to heat up. Not what you want in your walls.
4 - It claims to produce 240v 20 amp SINGLE PHASE. That means both those circuits had better be on the same phase in your house. Do you know if both those circuits are on the same phase? What happens if you plug it into two different phases (I have no idea how your house is wired).
5 - I know nothing about the electrical requirements of a level 2 charger that this thing claims to mimic. Does it expect 240v 2 phase power? If so, what happens with single phase power going to your car's charging circuit.
Granted my electrical engineering degree is now 35 years old and my memory of AC power is long since rusty, but the bits I remember says this is a really bad idea. Someone is taking some serious liability selling a product such as this from what I can tell.
Also notice the Note further down on the web page "Note: User assumes all responsibility on use. It is the users responsibility to check the inbound voltage,electrical joiner box outbound voltage, and total amp draw to verify these are not going to be overloaded. The user agrees to test the amp draw of any appliance or machine that they plug into these converters to ensure they are not being overloaded. Meters are cheap and mistakes are expensive. You can purchase a meter at https://www.steam-brite.com/voltage-...er-p-6259.html
User agrees to hold Steam Brite, its employees, and agents harmless in the event of any use of said use of converter. The user agrees to not hold SteamBrite and all employee against any problems that arise out of the use of said converters/ inverters. Remember, just because it plugs in does not mean it is OK to use!
" Notice that last sentence. Do you want to take this on?
I'd use that $282 towards a proper level 2 charger installation in your garage, not this device.