Dont get a HP+ printer.
HP printers come in two fashions. A plain version and a HP+ one. While the hardware is the same the former are slightly more expensive and, the latter require you to use HP+. You can tell which is which by the product code (HP+ have their product code end on an _e_)
Measured by the standards of the printer industry I was pleasantly surprised to see HP posting the online requirements very clearly on their website: - Internet Access (the German version is even stronger on that requiring „constant internet access“ - A HP Account