If the laptop supports hardware RAID, they'll definitely design it to have 2 drive bays. If hardware support is not possible you can software RAID using Windows. Even with software RAID If you don't have 2 drive bays but have a DVD-ROM, DVD/CD HDD caddys still exist as an option, but often it does not have SATA III support.
However with SSDs already being massively parallel, affordable for the performance, and amazingly low latency, raiding them will only get you higher bandwidth or another way to get more storage as a single disk. By the way RAIDing SSDs will more often negatively affect latency. I wouldn't even bother to RAID laptop HDDs. I'd just do what I can to save money for an SSD.