But only these three in the entire settlement, as far as the E1 plots are concerned!
It depends on how large the apartments are supposed to be. With a plot of 700 sqm, a GF of 700 sqm*0.7=490 sqm is possible, net about 490 sqm*0.8=392 sqm, which makes about 65 sqm per apartment. Not exactly big, but feasible. And the hillside location also favors this, as living space is possible in the basement, which is not counted towards the floor area ratio. But I share your opinion:
calm down
Even with single-family homes, you don't know who will move in. A sociable family with regular barbecues and membership in an MC can cause significantly more noise than six singles who work all day and go to town on weekends.
We also had our development plan checked by an expert.
If this is so important to you and you have made it known, I wonder what kind of expert that was and what he checked.
that someone opposite will build a bunker
The development plan with its height restrictions already ensures that this will not happen.