I know nothing about the Maxwell Roam (and can find nothing about it on the Internet). As for MotorhomeWiFi, there are a number of products - to which do you refer?
A Wifi system will not boost your 4G signal.
I believe it is still current UK legislation that Mobile Phone Boosters are not permitted. You can fit external aerials which will probably help but not boosters (a subtle difference I know)
I don't know either product, so this is a generic answer: no.
Boosting 4G signal won't speed up video streaming. It may even slow it.
If you want faster streaming, you need to give your 4G modem a clear (not strong) direct signal. Then connect to it with a cable, not WiFi, if at all possible.
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