Wifi safe lockable container to keep router

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I need a wifi safe wall mountable lock box. It does not matter if it’s see-through or not. What matters is that it can hold a 10 x 5 x 5 size router, does not block radio waves and does not interfere with the wifi. Now the challenge here is that, aluminum, electrically conductive metal such as copper blocks radio waves. On the other hand, plastic, rubber or wood does not block radio wave.

I am finding it next to impossible to find a safe or lock box that falls under this criteria. I searched online on home depot, walmart, called some branded companies so they can help guide my search. No luck.

The context here is, I have a 3 storied apartment where I am on 3rd floor and have airbnb guests on 2nd floor. To avoid spending money on wifi extender, I installed the home router on 2nd floor on one of the guest room so all floors fall under the wifi range. After talking to verizon, I learned that it’s not secure to have the main router where stranger can access it as s/he can click the reset button and erase all the custom passwords I set up. This raises a red flag, so verizon suggested two options - 1. find out a wifi safe lockable container to lock the main router so guest can’t poke at it, 2. move the main router to my room on 3rd floor which will require running an ethernet cable from 2nd to 3rd floor. If I am doing it myself, I will have to run a 100’ cable from inside, but this will most likely be a technician job who can find a much shorter path through the window from outside. Also, with this 2nd option, I will need an extender for 1st floor.

I wouldn't mind spending money on the 2nd option but the issue here is, I am staying on my property temporally and will be moving sometime early next year. I am aiming to have the entire property for long term rental by that time. 

So still go ahead with option 2 even though in future my room will be occupied by tenant anyways? Or should I try to find a lock box? I am gonna lean toward the cheaper option as both sound valid to me. But any suggestion on the lock box will be much appreciated. I got some suggestion from walmart as they suggested to use plastic create with staple for cable. Am I going crazy on this? Has nobody face this situation? What is the practical approach to this situation?

Thanks in advance!