Dev mode set up on Xbox one x won’t let me set up on Xbox series x

I have same problem won’t give me refund. Microsoft has it set up where you can’t get help I need series x version

Question currently i have 2 xbox ones in the house only one console can be a family set up to share game pass and live with the family.

When I get the series X will this allow me to set the X and the one as 2 separate family devices?

Neither the xbox one x or the series x are online only consoles.

You do need to be online the first time you set up the console then once it's setup you put it into offline mode & you can use it offline.

Don't own a PS5 but i'm pretty sure you need to be online when first setting a PS5 up as well.

Modern consoles need software updates when you first set them up.

The intakes are at the bottom

But the consoles cooling system is on the top and the carpet isnt very tall