Hi XF,
Thks for you reply and help to paste my floorplan (i dunno how to paste it directly

)
https://ibb.co/gS8Bq2C
I hv indicated the 3 Lyra mesh in the below link photo. Lyra 3 basically is just for my gal's PC which do not hv a wifi adaptor and not for improve eifi coverage purpose actually.
Yes ONT is with the main router. I laid the network point during my reno thinking if the wifi unable to cover i still hv smthing to rely on
Why i am thinking of the 2gbps plan is because the sum paid for the 24 mths contract period is not too much of a difference. 1gbps with GT AX6000 is $36.50 + $13.12 (router) x 24 mths = $1190.88 whereas 2gbps with same AX6000 is $53 (include router& still get a tplink ax72.) x 24 mths = $1272.00. Difference is (1272 - 1190.88) = $81.12 over 24 mths.
But i m not too sure what benefits and how much does this 2gbps with AX6000 will improve on the internet speed. My gal complaint to me that at times she is unable to play her Roblox in certain area (not fix) of the house which i am not sure why? But using for streaming or net browsing is ok.
If say i use the GT AX6000 as main router in the living hall and AC2900 in my master room as mesh and Lyra 2 & 3 remain as it is. Will i be not getting the wifi 6 type of speed or connection? Wifi 6 mix wif wifi 5 is there any disadvantages? Sorry i am a noob in this.
Hope to hear from u again.
Thank you