If you just HAVE to have a Show in your office, I have an early model HD10 Fire tablet that works great as an echo show (they have "show mode"). It picks up great and is easily directional by standing in front of it, and less sensitive when to the side or behind it. It is a suggestion for you. I'm not selling mine, but suggesting a possible change to another Show option. The 5 is very wonky in a house where there are mulitple Devices within range of one another. I did Show 5's for a short while and opted to gift those to some family members and moved to echo last gen "Puck" Dots... Not sure if I will go for the new ball ones... Maybe a new Apple Home Pod Mini instead... A bit more on the cost, but they are pretty cool for an apple environment person like me.
Also, I could recommend changing the Wake word name for the dot in one room or the other as well... I have 2 Dot Clocks in my bedroom, and to separate them I set one up as "Computer", the other as "Alexa". I can easily give them separate commands that way.
ONE CAVEAT (for the wake word change situation)... if you start a music set on one dot, no matter the wake word, if you tell another to "Stop" whatever wake word is used has no special application, it stops all echos that are playing music, on the same user account. even if they are not in hearing distance of one another. My mother in-law keeps cancelling out my sleep music, by telling her Dot "Alexa Stop" and mine is in the far end of the house and is Wake-word-set as "Computer"...