@BubbaATL 

The little 6 is likely WiFi6, which sadly isn't 6ghz.. the naming at the moment is awful!       In short, WiFi6 uses 2.4 and 5ghz, there was a version 2 of WiFi6 now labelled WiFi6E (E for extended), exactly the same just now also has 6ghz frequency.   The W7200 doesnt support the 6ghz so its just regular WiFi6... clear as mud?  :)

The X75 is a big unit, its kinda towards the top of the range.  The reason I suggested it was Tri-Band, basically the W7200s you have at present can have 3x connections between eachother for speed, the x75 also has 3x so will not 'degrade' anything.   That said as your internet is 100mbps, a Dual band model like the X50 would be cheaper for you and still do the job perfectly. 

Yes... Deco models!     As quickly mentioned earlier we are starting to see 6ghz devices appearing now and this has messed up things badly, means there are really 4x different generations of devices in use

• WiFi5  Also known as AC works on 2.4 and 5ghz, deco models all start with E M or P..  E being the lowest, M midrange, P Performance (M5, P8 for example).  These are slowly end of life now
• WiFi6  Also known as AX works on 2.4 and 5ghz, deco models all start with X for AX (X20 and X75 for example).  These are the most common now, been around a few years.
• WiFi6E Sadly its known as AX too (annoyingly), and works on 2.4, 5ghz and 6ghz .  They are the XE range and are fairly new.. say 6 months now
• WiFi7    The latest and greatest, works on 2.4, 5ghz and 6ghz and will be the eventual replacement for WiFi5/6/6E.   Its REALLY new, likely barely out new but offers massive speeds (at a cost). 

It was unfortunate that the powers to be decided to Extend WiFi6 (WiFi6E) not long before announcing its replacement.  It really means that 2 different generations of device came out within a year of each other and messed things about!

Lastly the numbering system,  It starts low and get higher...  so the E3 / X20 is the lowest...     M5 / X50 is midrange and P9 / X90 is the highest..    Your current are 7200 so 7.. pretty high up there and why I thought the X75 might be a good choice, but as you say with just 30 devices the X50 is more than capable and save you some $$

  @Philbert Thanks again.  I am going to give that X55 a try, will let you know how it goes.

Cheers,

Bubba