BBC rental agreement for dependent visa


I recently moved ( 1 week ) to Belgium brussels on WP and is valid for next 8 months. Now I want to bring my family, for which I need a rental agreement. But when I looked around, people say minimum 1 year contract. But as of now my WP is valid only 8 months.

So if I go for a BBF / service apartments with a rental agreements for 1 or 2 months, can I provide the same to embassy, while applying  dependent visa. Also wanted to know, how much time will it take to get the dependent visa.

Also, do I need to stay in the same address, till the dependent arrives.

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