I want to upgrade rats cage

[AlaskaPets]

I want to upgrade my two male rats cage they currently live in a
Kaytee My First Home 30 X 18 Multilevel Exotics cage and, according
to the rat cage calculator, it can house 4 rats but I personally think it's too small.
And I want to get a second one to put on top of the cage I already have and tie it down with zip tyes would this work?
or would it be too wobbly? has anyone tried to do this?

 

[Nibbskatz]

I have a two story critter nation model 162. I love love it!!! I have 3 boy rattles.
You can get one level to, and add later with this house. Double doors open all the way

I want to upgrade my two male rats cage they currently live in a
Kaytee My First Home 30 X 18 Multilevel Exotics cage and, according
to the rat cage calculator, it can house 4 rats but I personally think it's too small.
And I want to get a second one to put on top of the cage I already have and tie it down with zip tyes would this work?
or would it be too wobbly? has anyone tried to do this?

for super easy access.

 

[Nibbskatz]

I have a two story critter nation model 162. I love love it!!! I have 3 boy rattles.
You can get one level to, and add later with this house. Double doors open all the way for super easy access.

Sorry I doubled pics still anewbe

 

[AlaskaPets]

I have a two story critter nation model 162. I love love it!!! I have 3 boy rattles.
You can get one level to, and add later with this house. Double doors open all the way


for super easy access.

Thanks for the reply! I've already considered the Critter Nation but it's just too expensive