If i have no FIOS STB's (just a cable-card) can i get whatever router i want ?

I have FIOS- currently all i have is:

The Gateway Router

A cable-card

Recently i belive my router had a serious breach and Verizon's reponse was typcial (i.e. useless - FYI if a Verizon "techical specialist" tells you to rename your SSID with something only you know, but tell me so i we can help you fix it AND then asks for your password -RUN !)) and so i'm replcaing the router.

This is what i'm thinking of buying:

http://www.bestbuy.com/site/linksys-wireless-ac3200-dual-band-wi-fi-router-black-blue/5601000.p?skuId=5601000#/?eventDate=&eventDescription=Saved%20Items&giftlistId=saveditems&giftlistItemId=094e02c2-3188-11e7-bbeb-005056920f06&giftlistType=saveditems&listOwnerFirstName=&listOwnerLastName=& 

Here's what i can't figure out:

1. Do i need to get a seperate modem or will the router above do everything i need?

.2. Do i just need to contact Verizon and have them switch me to Etherney Only (so no coax)

3, This router has built in VPN (and i already signed up for this VPN  (https://www.privateinternetaccess.com/pages/buy-vpn/) - what do i need to do to make sure it works ok ?

4/ Anyting else i should know ?

thanks in advance !