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Ducted heatpump

As per description. Have 4 bedrooms upstairs that I want to get vents in, return cassette can be in hallway. Happy with either a 10kw or 14kw unit. Prefer a name brand and would be even better with wifi control. We have an existing high wall downstairs and outdoor space is pretty hard to fit another inverter in so wondering if possible to wall mount. We have a roof over the lounge that does not have a second story and a window that can go out onto that roof for easy access but not sure if it’s viable or not to install the unit there? Picture is reference for what I mean by wall mount. Have a roof cavity obviously.