Apologies for delay.
Who presented you with this diagram of where panels would likely go? Often what happens is a sales person will sell a certain size system, but the installer will get to the house on the day and finds out it won’t fit. Then they have to downsize, and you need to renegotiate on the day. It can be really annoying. I would be asking for a site visit before the install by a licensed designer/installer, because your roof is not ideal for solar. The south east roof is really not facing a good direction. You’ll receive only about 70% energy production there compared with north roof.
I would maybe look at getting as many panels as possible on north and west roofs, and just install that many, rather than using east. But on the other hand, if they can make the design work by also putting a few on the east, and the cost is similar, then that could be fine too. Either way, you should work that out before they arrive on the day to install I think.
Regarding panels, Jinko and LONGi are both fine. Given your difficult roof space though, you want higher efficiency panels, so they take up less roof space. Probably the Jinko, but you can check the spec sheets.
Huawei seem to be making good inverters. I’d be very happy with a Huawei, but at the same time Fronius is probably the most reputable inverter brand in the market. So it’s really about your own risk appetite as to what you should choose.
Hope that helps.