Hello, oh my 2 old post is still alive
then I can report from experience, we are very happy with the "Friedhofhecke" Thuja. Planted alone last spring, bought at the nursery. There are a total of 95 pieces, I believe 2.5 per running meter.
Last year was tough because of the extreme summer. You have to water a lot during the first 3 years, last year about 16 pieces of ours died. The nursery generously replaced them for almost free. This year they are already blooming great. My wife also planted some bamboo. Allegedly, this type of roots is not aggressive, but we will see