Get in one tent/get under one tent

Get in one tent/get under one tent
 

Not sure if this is an idiom, or if it is some kind of a cliché.

My small context is this,

"You have this kind of lumping together of several observations and when you get enough of them in one tent, you got a diagnosis."

I tend to take "in one tent" as in "en una tienda" "en el mismo sitio", but I don't even see the need to translate it literally.

I'd say something like,

"Tienes esta especie de cajón de sastre de observaciones, y cuando has reunido bastantes, tienes un diagnóstico".

Any feedback on this, and/or data on the expression will be welcome!

Difficult...

Tent in general has four "walls" and then it would be "in the tent"

If someone calls tent a canopy/gazeebo like (quincho) the it would be "under the tent"

Whether the tent has walls or not, one is always under the tent. In English, we may wrangle over 'in' and 'under'. I cannot help but appreciate that in Spanish, as in JPablo's translation, the need for 'en' or 'debajo' do not even arise.

Okay, thank you for your input, at any rate!