Haven't you got a panoramic roof ?, I think that will let in the signal you need 360 degrees fix although you can have a few gaps in the arc. The example is here, if you lost the front ones interfered by the wire in the heated windscreen you wouldn't get a good lock:
I will have to do a before and after. There is debate online about heated windscreens messing satnav up which is why for the Atecas with the heated windscreen they move the GPS aerial into the sharks fin - if the Ateca had one - the back aerial assembly. Probably like the TDI150 engine, an engineering hole of things not matching.
I've got Android Auto loaded up ready but I will use it in emergencies when the car satnav is clearly not right. Went onto that two weekends ago when the M25 and M1 snarled up but everybody else was on the same back road route.
I have had the VW Car-net loaded up and looked at that on the remote possibility that it might work with the Seat Navigation Plus. UK VW owners with the Discovery Pro can send map coordinates to the head end. I will try that out when I get the car. They can't do anything else with it. In Germany it will pop the doors etc
I'm understanding better now what the wifi bit of the Seat Navigation Plus does, one of the things it can do is turns the car into a wifi router but since the car doesn't have a SIM that's only for connecting up the car to a dlna music server which is your smartphone or device that you put online via wifi into it. Gracenotes, since you have asked (

) basically that will sort out your album art if you don't have any embedded in the file, don't have a file that is no more than 500x500 with a name such as cover.jpg in the directory, so it's a fall back position. Quite a bit about the size of the album art. The manual tells you about the the order that it looks for album art. Will only look for Gracenotes on the Plus, but does the rest for the lesser mortals.... I'd aim to get an album art file on all music rather than rely on Gracenotes. I don't go above 500x500 for indoor use.
Oh yes and the Navigation Plus has twice the power output than the standard system. Then it gets confusing on the technical manual, it tries to say if you have Seat Sound you have Navigation Plus, I'll want my money back if that's the case. Think the technical authors have drifted at that point.