First of I would look to see what your wireless spectrum looks like, if you have an android phone download wifi analyzer from farproc its on the google play store. Find out what channels are the least congested, if you want to look more into wifi you can check this site out »
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I would recommend depending on your house configuration to place the modem and router in the middle Highest point of your house. If you have a big house(Over 2500 sq ft), Bright House Echo is a good scalable service that uses MoCa and dedicated access points to eliminate Wireless dead zones. If you go with Echo, the Technician will direct you where the best location of install should be. Think of it like an umbrella its best to have the modem on one side of the house and an Access point on the other blanketing the whole home.
If it is available try and get a modem only if you are going to use your own Router. If you go with Echo you will get a TG1672 or ADG1670 which are both really good daul band gateway/modems.
First Test Once installed you are going to want to run is Ethernet Based, you will want to see 55mbps+ from speedtest.bhn.net Make sure the test goes to Orlando or Tampa. Speed increases are going to happen soon so 60 will go to 75 in that case you will want to see right around 75 when connected direct.
If you get the speeds hard wired at that point Bright House has done their part, if you have wireless issues at that point its on you because you are using your own router.
On the 2.4 Ghz you can expect 30-50 mbps within 20 feet of the router
On the 2.4 Ghz you can expect 10-20 mbps within 60 feet of the router
On the 5 Ghz you can expect 60+ mbps within 15 feet of router
On the 5 Ghz you can expect 35+ mbps within 40 feet of router
On the 5 Ghz you can expect 20-30 mbps within 60 feet of router
These are just some numbers I would expect based off the router you mentioned. There are many High end routers that will push 300 mbps true throughput . The closer you are to the router the better. Avoid Metal Enclosures, Exterior walls. Wi-fi has to go through things, so every wall it goes through the signal degrades. If you have gamers in the house Echo is a good option, it allows for Hard Wired speeds and stability through the Access Points.