One little thing that might affect you. When my FiOS service was installed 3 1/2 years ago, the installers refused to connect it to a wall outlet that was GFCI-protected. The reason was that, if the GFCI tripped, electrical service to the ONT would be lost but I might not be aware of it until the battery in the BBU was drained as the rest of the house would still have electrical service. A GFCI can sometimes trip for pretty insignificant events that would really pose no danger to the ONT or BBU. I don't know what Verizon's position on connecting to a GFCI is now, but if your nearby outlet is a GFCI, or is GFCI-protected, you might want to be prepared to change it out.
Just something that might affect your installation.
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Justin
Verizon FiOS TV, Internet, and phone
IMG 1.6.0, Build 06.89
Keller, TX 76248