Home WIFI - time to start growing up

My WIFI probably is considered better than most as many still have "N" or below based wireless access points and likely wireless routers.

But with the amount of wireless streams including the fact that I stream my cable channels over my network, there needs to be an upgrade.

My current setup:
Upstairs:

• ASUS RT-AC68P running in Access point mode(using RMerlin firmware) with
• Internal 5ghz SSID
• Internal 2.4ghz SSID
• Guest 2.4ghz SSID
• Guest 5ghz SSID

Downstairs in basement:

• ASUS RT-N66R running in Access point mode(using RMerlin firmware) with
• Internal 5ghz SSID- different from above SSID

There are other network details I'll note on different posts, but for sake of this I'll focus on wireless

I have on order an AP from Ubiquiti, a UAP-AC-PRO-US "Enterprise grade" access point.  My initial thought will be for validation purposes is to do a shift of access points for better coverage and hopefully prepare to get more Ubiquiti APs for one cohesive system.

I also want to try to get to a point of not needing 2.4ghz bands

Phase I Plan

Upstairs:

• UAP-AC-PRO as primary house access point somewhere on 2nd floor - placement to be determined.
• Internal 5ghz SSID
• Internal 2.4ghz SSID - hoping to limit this if possible
• Guest 2.4ghz SSID - separate vlan/subnet off router
• Guest 5ghz SSID- separate vlan/subnet off router

Downstairs in basement:

• ASUS RT-AC68P running in Access point mode(using RMerlin firmware) with
• Internal 5ghz SSID - different from above SSIDs and  separate channel from above

Upstairs in bedroom over garage:

• ASUS RT-N66R running in Access point mode(using RMerlin firmware) with
• Internal 5ghz SSID- different from above SSIDs and  separate channel from above

We'll see how things go when the new device arrives.....