Fencing in RLP: Is a small fence allowed on private property?

I'm only concerned that we know where our property ends and up to where one can plant things.

Wouldn't it be enough to plant the desired plants instead of a fence?
I always enjoy seeing gardens without fences. For me, that means: the neighbors get along with each other and animals – like hedgehogs, for example – can live there well.
But I admit:
That is no answer to the question ;)

Plants obviously grow as they please, and if I have a clear line up to where I can go, then I also know where I have to cut. ^^ Otherwise, I would be afraid that we would keep expanding sideways and that in 10 years there would be trouble and I would have to tear everything out. ;) My parents have that, a property without a fence, and they have been annoyed by it for 40 years. Some trees that then dropped needles on their clothesline, etc. .. I don’t want to be that kind of neighbor for those around me, nor would I tolerate something like that. But I also don’t want to cause stress, so I would like to create facts.

By the way, I received a first offer in the mail this morning. Double rod fence 123cm in anthracite, including installation €6500 gross. That is €72 / meter. Is that usual? Seems more on the upper end of the scale to me, but I don’t have any comparisons yet.

Which thickness of double rod mesh fence? After a conversation with a friend working in garden and landscape construction, I was somewhat enlightened about the price differences. Most use the wire thickness of 6/5/6, which is significantly cheaper than the also available 8/6/8. The quality of the posts also depends on this. To be able to assess the offer, you need to provide a bit more information.

What strength double rod panel? After a conversation with a friend in garden landscaping, I was informed about the price differences. Most use the wire thickness of 6/5/6, which is significantly cheaper than the also available 8/6/8. Depending on that, also the post quality. To be able to assess the offer, you need to provide a bit more information.

It was 6/5/6. words words words

We have now simply put wooden posts next to the neighbor (about 2-3m apart) and stretched chain link between them. Then reed mats in front of that. These double rod mats are personally driving me up the wall. I can understand that people appreciate the combination of being just okay in terms of price and durability, but I have now also decided on a wooden fence towards the street. If I ever win the lottery, I will have a nice wrought iron fence made...

We simply set wooden posts by the neighbor now (about 2-3m apart) and stretched chain-link fence between them. Then reed mats in front. Personally, I'm fed up with these double rod mats. I can understand that people appreciate the combination of being just affordable and durable, but I have now decided on a wooden fence facing the street as well.
If I ever win the lottery, I'll have a nice wrought iron fence made...

How much does something like that cost?
Setting wooden posts yourself also means you have to make concrete and set the parts straight, right?