This is a complex question. What type of business is it? Are you intending on living in Spain long-term? I'm not sure that having e-residency would be beneficia

This is a complex question. What type of business is it? Are you intending on living in Spain long-term? I'm not sure that having e-residency would be beneficial, but you have many options wrt the set-up of a business (depending on the type of business) and setting up a Spanish SL may not be the best choice for you. (I have a Spanish SL but also for many years had a UK based Ltd as a Spanish resident, which I got rid of after the Brexit vote).