@CDH_Surrey my home is not anything like as complex as your's to network but I also hit issues with the Wifi Max pods and therefore rejected WiFi Max and use a set of TP-Link Deco units mine are the okder ones that are only WiFi5 but give decent speeds over 200Mb/s in every room and 500Mb/s in my main living area which is ample..
You turn off the WiFi on the Sky hub and connect the first unit to it by ethernet then set up the rest of the units by using the manufacturers app. With Deco units you can set them to act as Access Points which simplifies the set up as few of the whole home kits can be directly connected to the ONT if you have full fibre. You can alternatively use these systems in router mode behind a Skybhub by having a double network address translstion set up which most apps accept but a few like company VPNs dont like. Loads of systems around Netgear Orbis are good as are Asus systems and TP-Link's Deco range I would avoid the all singing and dancing systems like Nest etc as these are less well suited to UK homes.
One point in choosing your system is what speeds you need where as very few people need high speeds in every room. In practice you will see minimal gains over around 100Mb/s unless you are downloading huge files. If you are gaming ethernet is always better than wifi simply because of stability.
Another point is one of the reasons why Wifi Max is not a brilliant choice in some properties like your's is the units communicate by using a third signal in the 5GHz band which suffers greater signal loss passing through solid objects like 15th century walls than the 2.4GHz band. The pods are great in timber framed homes with plasterboard partitions which many US homes have in my opinion it is less good in UK homes.
Hope yhst helps.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
