Keep the shared fence at 120cm. Get already big bay laurels and plant them in front of it (I hate these plants, but with you they actually make sense).
It's thousands of € cheaper and reasonably dense in a year.
How big? I would have to put up about 100m of fence to my neighbors if I wanted.
I'll look at pictures tomorrow and in the next few days and see what's available in the neighborhood as ideas. It's hard for me to go down to 120, but as I said, I'll check.
We don't have 100m, that's really a lot. It would be about hm, well to the neighbor with the terrace, about 10m, on the other side the property is empty, that would be 22m, then at the front to the street 15, and at the entrance next to the house 8. I'll check tomorrow, I estimate about 50-60m. I really don't have the measurements in my head anymore how long our property is. If it's about fence payment, I would also like to have a neighbor on the other side. If you agree, you really save a lot. The property belongs to the same owner from whom we bought. I've often thought about whether I should ask him if we build it centered on the border, he contributes, and if he sells, he can get the money from the buyer. However, I wasn't sure if that would come across as cheeky and who knows who moves in there, I'd rather build on my own property. I have to weigh now, think about it, etc.