I run the online store https://wp-shop.org and I want that single domain to resolve correctly on three separate WordPress installations. Each site will display identical content, so visitors should enjoy the same pages, products, and functionality no matter which instance they reach. Here’s what I need done: • Configure DNS and hosting settings so the primary domain points cleanly to all three WordPress sites. • Set up the domain-mapping workflow inside WordPress (multisite, reverse proxy, or another proven method—whichever is most reliable for this scenario). • Ensure SSL certificates work seamlessly across every mapped site. • Replicate my existing site files, database, and settings so content stays perfectly in sync. • Recommend and install any essential plugins you feel will help—SEO, security, or e-commerce—since I’m open to expert guidance. • Perform final cross-browser tests to confirm that pages, checkout, and admin areas behave identically on each instance. Success is a fast, secure, error-free domain that mirrors the same store on all three sites, ready for traffic and easy for me to maintain going forward.