I don't think you can order Dell laptops with the 24-hour repair warranty, but there's plenty of companies which sell them with said warranty - they buy hundreds(thousands more likely) of them as a businesses and then you can buy them directly as a customer, 24-hour repair warranty included. Every single one of my Dell laptops was purchased like that, I once had the Dell technician replacing the whole motherboard on my XPS 13 on my living room table.
I bought an XPS 15 just before Xmas and the sales rep was really trying to sell me on-site repair and it wasn't even that expensive (IIRC, ~$70 CAD upgrade), keep in mind this is Dell Canada so US might be different.