Aircon air handler positioning

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Hi
I’m having multi split aircon installed for main area heating/cooling next week. Have discussed it in depth with the company and they’ll fit an outdoor Toshiba condenser with three indoor air handlers.
The most common position and probably the easiest for the indoor units is high on the wall and that’s what’s been agreed.
Main use is for heating the main living areas and the system is sized accordingly from the survey (3 x 2.5kw units). As heat rises, I’m wondering if the air handlers in this position will be ok.
Spoke to a neighbour who had something like this taken out. Says the high positioning wasn’t working as heat rises. It’s a council bungalow so maybe not sized sufficiently.
Now has ASHP wet system.
This will be my downstairs heating so just wondering if normal radiator positioned units might be better.
I realize that not many here have multi split aircon but any experience or help would be appreciated.
I’m having multi split aircon installed for main area heating/cooling next week. Have discussed it in depth with the company and they’ll fit an outdoor Toshiba condenser with three indoor air handlers.
The most common position and probably the easiest for the indoor units is high on the wall and that’s what’s been agreed.
Main use is for heating the main living areas and the system is sized accordingly from the survey (3 x 2.5kw units). As heat rises, I’m wondering if the air handlers in this position will be ok.
Spoke to a neighbour who had something like this taken out. Says the high positioning wasn’t working as heat rises. It’s a council bungalow so maybe not sized sufficiently.
Now has ASHP wet system.
This will be my downstairs heating so just wondering if normal radiator positioned units might be better.
I realize that not many here have multi split aircon but any experience or help would be appreciated.
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2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 2.5kw inverter. 28MWh generated, long-term average 2.6 Os.
Yes, all the ones I’ve seen around and about are mounted the same. My local shop and car service centre have single splits with above head height mounted units.
But they are shoulder month use for us as heat.
The vanes adjust to push air down to floor for heat and across the ceiling for cooling, by default.
Should be up and running tomorrow. This is my heating system so will figure out best settings.