

I scoured their website and they completely fail to explain what they are actually doing on a technical level. I assume it would probably be a GPON network, just based on the offered speed. Not the best type of fiber connectivity, but probably pretty normal for the USA market.
That said, single mode fiber is absolutely the way forward and if you replace the devices on the end it can scale almost indefinitely. So I would jump on the occasion of having some laid to your house.
They don’t have IPv6 and they don’t offer static IPs which both kind of sucks, but it might be acceptable: https://support.surfinternet.com/surf-broadband-fiber-faqs No data caps is good at least.
Concerning your question about the markings, they spell out their process on this page, it does include marking existing utilities: https://surfinternet.com/fiber-optic-installation-process/
lol, the “j l’ai lu” domain is pretty funny