@TinaChico
It is very frustrating, but many of these visa/residence applications require a proof of address in your new country (along with proof of funds, and proof of health insurance). And many of us would rather have our residence permit approved first, and then go buy/rent something.
And I think maybe you've been doing the Spanish immigration thing for quite a while, so I can understand that you're getting totally fed up with the whole process! But, fingers crossed, it will soon be over...
The proof of address is normally the deed for a property you own, or a long-term rental contract. The padron (at your local town hall) will want to see this before giving you a padron certificate. Perhaps the embassy will accept a short-term rental, and a promise to find something later... but it's very unlikely that the padron folks would accept it.
HOWEVER the NLV does NOT require a rental contract OR a padron certificate (see the official info below). So I was rather confused... and so re-read some of your earlier posts. It seems you have applied for a different visa, not the NLV (autonomo perhaps?), and it is already approved. Is the consulate really insisting on the padron?
As the padron is not needed for the NLV applications, my guess would be that you're on the NEXT stage, which is getting your TIE (Tarjeta de Identidad de Extranjero, your official biometric ID card). This process DOES require the padron certificate. If there's no time limit on getting the TIE, then wait for your family's NLVs before finding a property. If there's a time limit on your TIE application, then you have to figure out a rental or a purchase in order to get the padron certificate.
Separately, the NLVs should be granted, if your husband has passive income (such as rents, dividends, pensions). So you should be confident that you will get them, and you can proceed with a property for the family. EVEN IF the NLVs are not approved, there may be an alternative of "family reunification". If you're a legal resident of Spain (as your TIE proves), you might be able to apply to reunite with your family members (spouse and minor children).
Official NLV guidance:
https://extranjeros.inclusion.gob.es/es/InformacionInteres/InformacionProcedimientos/Ciudadanosnocomunitarios/hoja010/index.html
Official Family Reunification guidance:
https://extranjeros.inclusion.gob.es/es/InformacionInteres/InformacionProcedimientos/Ciudadanosnocomunitarios/hoja012/index.html