WAX204 802.11k or 802.11r

What kind of roaming features you have in mind?

No idea if the WAX204 - based on a consumer router - does have 802.11k and 802.11v capabilities and have it enabled (we're told the WAX214 and WX218 do for WPA2-PSK, but I've never had these in my hands). All of this is ways beyond of what such a simple standalone or how Netgear names them essential needs. 

Talking of FastBSS transition aka. 802.11r we need to understand this requires more tech and config - either by manual configuration of the (same) mobility domain identifiers on the individually managed APs, or by a management platform like Netgear Insight which allows to simplify this process to a single on/off control. The primary advantage of 802.11r is with the 802.1x client authentication so saving a lot of four way handshakes, reducing the roaming delay by pre-authenticating clients with multiple target APs before a client roams to another AP. With 802.11r implementation, clients pre-authenticate with multiple APs.

Also understand that even the so popular Mesh systems work with Radio Resource Management (802.11k) and BSS Transition Management (802.11v) - what is in general perfectly sufficient for a reasonable good roaming experience:

The 802.11k standard provides mechanisms for APs and clients to dynamically measure the available radio resources and enables stations to query and manage their radio resources. In an 802.11k-enabled network, APs and clients can share radio and link measurement information, neighbor reports, and beacon reports with each other. This allows the WLAN network infrastructural elements and clients to assess resources and make optimal mobility decisions to ensure QoS and seamless continuity.

The 802.11v standard provides Wireless Network Management enhancements to the IEEE 802.11 MAC and PHY. It extends radio measurements to define mechanisms for wireless network management of stations including BSS transition management. 

And if I mentioned 802.11r for WPA2 above - the Fast BSS Transition (802.11r) for WPA3 is rather new even if introduced in 2019 already, the implementation base is limited. FT-SAE (WPA3-Personal), FT-EAP (WPA3-Enterprise) FT-PSK (WPA2-Personal), and WPA3 transition modes and PMF are rare. Also note that  both needs to be implemented as Over-the-air and/or over-the-DS variants.

You seriously expect all this on a 70 USD street price WAX204?