What places are you going? What are the odds they have >65mbps speeds? In my experience, most airBNBs and hostels will not. If you’re mostly going to be using co-working spaces or places with guaranteed high speeds, I say worth it. I’ll also note the Beryl AX can theoretically get 300mbps with Wireguard.
No DN visas let you freely travel across Schengen. They let you stay and work in that country. 90/180 still counts for other Schengen countries.
My laptop is locked to location services = on. I hard wire into my router with WIFI and Bluetooth turned off. Never had an issue and I semi-regularly review my logins, all of which report my “work location.”
Looking into r/churning. Get all of the sign up bonuses you can. I’d highly recommend US Bank Altitude Reserve. $500 back for $2000 spend + 4 lounge passes + extras. I’ve done it and just got my girlfriend to do it too. Start there.