As someone who manages a tailscale network at my work...I just want to point out that tailscale is a tiny bit more complicated than just downloading and installing. Not much but...
That said the ability to automate wireguard connections is wonderful and everyone should check it out.
Yep c flat or b sharp. If the octave has a half step between notes (a full step is A to B, B to C, etc), then a sharp/flat is created. The octave dictates if we call it a sharp or flat, but from a mathematical perspective they are the same tone.