Can a multisplit outdoor unit be hung on roof beams?

Horrido,

we currently do not have air conditioning in the house, but we want to retrofit a 2-unit multisplit for the upper floor. Since we have a roof overhang of just over a meter with open beams and I found a very inconspicuous yet technically suitable spot today, the idea came up to simply hang the outdoor unit on the roof beams in front of the wall. That way, I wouldn’t have to drill into the wall for the outdoor unit’s bracket and would just have a local locksmith weld a frame for beam mounting.

Has anyone possibly done this before? Google is not very helpful. Unfortunately, I have no experience with how much such an outdoor unit "hums," i.e., whether any noises would still be transmitted to the roof structure and thus the house despite rubber dampers.

So ours is on the roof (old building from 1900) and when in operation it can already be heard in the room directly below. This is despite the console with vibration dampers! The noise development is manageable, but you should definitely expect to hear something. How strong it will be is probably difficult to predict.

Our outdoor unit is also mounted on a bracket with vibration dampers on the roof of an old building. Device Comfee, year of manufacture 2020. The outdoor unit is not audible inside the house, not even in the room directly below. From outside, the device can be heard due to a slight humming, but it is hardly noticeable.