Routing cable for modem/router in master br

[Bruce P.]

Hi,

So currently a cable company operative stopped by my friend's house to route the network cable for the Internet modem into the master bedroom. As it turns out, they are claiming they can't run it through the attic (the attic doesn't extend far enough apparently) and they say they can do it 2 ways - drill a hole in the master bedroom wall that adjoins the guest bedroom where network cable is already laid.  Or they can drill a hole through the closet in the master bedroom so the network cable can be routed from outside and the modem hooked up in the master bedroom.

The whole point of doing this is to secure a modem and router in the master bedroom since my friend will Airbnb the unoccupied rooms but doesn't want to leave the modem/router in an unsecured location for security.

1) If she chooses to route the network cable from the closet, is there a good way to lay down the cable so people don't trip over it? 

2) Are there any other alternatives to securing the router in the master bedroom (my friend's room - she is the primary owner/occupant of the house and the door has a lock on it)?  Currently it's in an open space next to the kitchen. My friend researched various lock boxes but wasn't sure if the signal would get dampened or the heat / lack of ventilation might be a problem.  Should she get a second opinion from a handyman or something?