I was just wondering if anybody can give me some advice.

I currently have Slingshot UFB. My setup is ONT - Mikrotik 260GS RouterBoard(for VLAN10 Tagging) - Netgear Nighthawk R8500, I have just signed up for Slingshots Naked Broadband service for the intention of using Slingshots GoTalk service as my phone line is still connected but I cant use it as I am using my Netgear Router and not their supplied NF4V. When I talked to the Slingshot operator he confirmed with me that once I have naked broadband on, and I am using the GoTalk service I can plug a ATA Adapter into a 3rd party router and use my old landline phone. Question is am I better off buying a VOIP phone or a ATA Adapter, and does the VOIP phone plug straight into the ONT or Netgear Router. Likewise does the ATA Adapter plug into the ONT or router. Also if I have to plug these devices into the router does the VLAN10 Tagging done in the   Mikrotik 260GS effect the VOIP packets. Thanks for any suggestions or advice anybody can give.