Everything can be arranged in one visit. One or two working days will be enough, provided that all the necessary documents are prepared in advance and all details are agreed.
You can, if the activities of your company will not physically occur in Spain.
A company administrator can be a person who does not have a Spanish residence permit, provided that there will be no need for hiring staff to conduct the company and the company will be subcontracted, through partners or employee / s – freelancer.