I brought TP-Link MR3020 and a bigger brother RE700X range extenders.
Powering these up in the hotel lobby at a distance of 3 feet, before having access to a room, and looking for their SSID on 2 different windows tablets ...
... neither appeared on the network list: only HiBarnsley, EPOS and hidden ...
... until I tried again in room 226 later in the day.
In the meantime I thought I could help with TerryG1's Bluesound Powernode setup: a trivial 2 step operation. All attempts to connect failed.
On to a ZEN MkII in 226.
This did eventually connect via the RE700X but not by the vendor's method (much checking for IP addresses on smartphone required) and operation sporadic.
On Sunday the connection to the ZEN was occasionally hijacked.
One such (cough, cough) when a visitor asked to hear Thriller.
Eventually achieved a modest 100db sound pressure.
Another time our ZEN connected to another ZEN somewhere!
My semi-educated guess is that too many people are trying to use tightly-overlapping wireless channels, hence the hijacking. Really needs an expert to design a robust operation
... which I think we do need ... after all, service streaming and high-res radio are becoming more mainstream. Depending on cost, maybe even
https://www.bytesdigital.co.uk/sectors/temporary-event-wifi.