Dave makes a good suggestion, try the #3 on it’s own as an analog for a bit and see what you think. I have the #3D non-WiFi, and I don’t think I would really need the WiFi with this cooker considering I can program the unit to cook how I want it. That’s pretty simple, but not as simple as the #3 on it’s own. My dad has a #2 that I’ve used a few times, and it’s so simple to just turn the dial and walk away and know I’ll get the same result as my #3D.
I do use a sous-vide machine that connects via WiFi and an app, i can view the cook from anywhere, but I’ve really only done that a few times.
But, you are going to love the #3! As for covers, I have a coversandall.com cover, it’s great. Keeps it clean - I have a lot of dust get on my patio and this cover keeps the dust out.
Enjoy and let us know what you end up with!