Use one Google Analytics account per business. You can have multiple stores/GA4 properties under a single Google Analytics account. To create a new Google Analytics account, follow these steps:
Go to https://analytics.google.com and login with the Google account (email address) you want to use for your Google Analytics account.
Click Start Measuring.
Name your account something sensible. It's a good idea to name your account after your company.
Name your property after your store.
Fill in the optional information about your business, click Create and agree to the terms of service.
Return to SlideRule analytics to complete your integration with Shopify.