Or use something like Opensignal that actually shows the real signal strength and direction from a particular cell.
I've had better results doing it manually, finding the mast location, measuring the compass heading on Google maps, and pointing the antenna directly at it.
The A stands for aggregation. No single chain of mobile data can ever go above 150Mbps. You aggregate them to get you 300Mbps or 600Mbps or even 1200Mbps on a CAT20 device.
I am referring to the back haul of the mast.
4G+ is EE’s name for carrier aggregation, so yes, no point in buying a multi-chain CAT4 or better device if your carrier doesn’t support aggregation. But only EE call it 4G+.
Android phones also seem to refer to it as 4G+, whether they copied EE I don't know

Why would you have a dual-Yagi if you don’t have more than one chain? CAT3 (no carrier aggregation) only uses one antenna. Single Yagi. CAT6 (2 cables) needs a second antenna to allow diversity and carrier aggregation. Poynting is a South African brand selling pretty ordinary amplified antennae for a lot of money. All Yagi are directional (think TV antennae all point in the same direction)
Saves going up on the roof again if 4G+ becomes available.
If the antenna cable(s) are properly terminated then you should lose no signal over a few hundred meters.
Signal loss occurs not just with the terminals but the cable itself, it's why I try to buy LMR200/400 when possible.
I use only Mikrotik and Teltonika. There is nothing wrong with Huawei gear for simple consumer use and if that’s all you want then TP-Link are every bit as good as Huawei and will save you some money.
I wasn't able to switch bands when I used the MR6400 so that's why I don't recommend it for areas without 4G+ as you can get stuck on the 800Mhz band, but for security reasons I would favor non-Huawei/ZTE products, also with Mikrotik/Teltonika is band selection available?
Putting the antenna indoors massively reduces the effectiveness. Do this only if you want to permanently compromise your system.
I am aware of the drawbacks but at the moment I am able to get very close to the masts maximum bandwidth with my current setup and it makes maintenance much easier, I may roof mount it if 5G performance is inhibited too much though when it becomes available.
You’ll get something that’s respectably quick but frustratingly variable. A cabled connection will always be more reliable and consistent.
Even over a privacy VPN I've had no issues gaming with a sub-50ms ping and it's been more reliable than the FTTC connection I've had which had a tendency to go down for a few hours late at night.