do I need to sign for packages from solarforce-sales.com?

The thread title says it all, really. I was just curious as to whether Solarforce-sales.com requires you to sign for the packages when they are delivered. I am curious because I might not be at home on the delivery day and might need to tell my neighbor to keep an eye out for the postman so that they can sign for it. I live in the USA. Please let me know=)
Thanks

I've had to sign for all of mine

Yes

thanks very much, fine gentlemen! I shall inform the aforementioned neighbors immediately!