[Riwerry]

As title says, I want to attach "plate" object with some text to house, so I don't have to do it manually, is this possible to do?

[TwinkiDaBoss]

If you mean attaching object to another object yes, but bare in mind the object must be server-created, you cannot attach it to default GTA object, you would have to map or something like that.
https://sampwiki.blast.hk/wiki/AttachObjectToObject

You could just create object, use editobject() and then move it where you want.
At the end just save the position

[SilverStand]

Attaching Object to another Object

https://sampwiki.blast.hk/wiki/AttachObjectToObject

Change Object Text
https://sampwiki.blast.hk/wiki/SetObjectMaterialText