Ask HN: Consultants, how do you manage client’s tech?

Hello there! I’m curious to know how to do manage your clients technology after deployment? I’m thinking the case of a local garage disposal client that has no knowledge nor interest in hiring things by themselves and are happy to pay for the peace of mind, or a coffee shop in a similar position running a drip e-mail marketing or adwords. Do you have them open their own accounts and you deploy to their accounts? So you charge a premium and host and manage things yourself? What kind of access/self service do you provide? Thanks!