It might. If turning it upside down changes the orientation of the sensor’s field of view, for example. Possibly more of a potential issue for a PIR sensor than a mmWave sensor? But I have no personal experience with mmWave sensors.
Looks like you are using motion active as the condition for the trigger, but it's motion on the same sensor -- I don't making that trigger conditional in that manner is helping anything (and could potentially impede trigger, depending on the reaction timing)
I would, but if it works OK, it's up to you... I just can't think of any positive for keeping it in there, but maybe I'm not considering something.
I just always try to keep my rules as simple as possible -- I only add redundancy / shore-it-up elements if performance deems such a thing necessary. Otherwise, keep it as "light" as I possibly can.
EDIT - I don't use any conditional triggers, but based on pic above, it looks like you'd need to remove something in the trigger there that's currently looking for a condition (ONLY IF part).
I think it looks good. If there are performance issues, I'd look at the motion sensor logs to confirm whether or not it's reacting as hoped (timely etc).
You walk into the kitchen, motion sensor triggers and sets lights to different levels depending on mode. Then the lights turn off after a timeout that also differs per mode.
I have a P1, but it's not mounted upside-down. I don't imagine you will notice anything since that sensor can be set to be very sensitive. I have mounted a Xiaomi Mijia sensor upside down before and it responded exactly the same. The Mijia sensor design is very similar to the original Aqara motion sensors.
I do know that some motion sensors recommend an upside down mount if the sensor is higher than a certain number of feet, as they are oriented when sitting for a certain field. Since the Aqara has a flexible mount you can mount it upside down and orient it as desired, so looks fine to me to do that.
You may also need to change the Delay to a wait, so that if the motion goes active again while waiting for the time to expire..it will be automatically cancelled.
If that is not possible (due to the delay “per mode”), you should make the DELAY statement cancellable. Then add a cancel delays at the top of the actions.