TP-Link XZ000-G3 works without any issues for my Airtel connection. Use the VLAN Tagging mode in the ONU itself or set VLAN on the
router. I got it for 1380 inc. shipping from LT Store.
Here's the buy link :
G3
If you want a little future proofing, go with the VSOL V2802RH, it's a little difficult to get it in India tho.
VSOL V2802RH is a bit more customizable, just like a SFP Module, you can change a lot of settings like SW version etc which cannot be changed by default on the TP Link G3. I saw a YT video where the guy was on some unlocked firmware but not sure how he achieved that.
Link to the video:
video
In that particular firmware he was able to change a lot of settings including firmware version.
Airtel just checks
GPON SN for authentication as of now but might check other things like SW version in the future.
Tata Play Fiber checks a lot of parameters before authentication so devices like G3 doesn't work with it.
For Airtel, G3 works flawlessly as of now so you can go for it.