Buy a hitch or spare tire rack to carry your bikes. At your height, you will find it almost useless to have a roof rack because it will be so inconvienent, plus all the downsides- loss of gas mileage, running into garage/low sign/drivethuru (yes, it happens more than you think)
If you do buy Yakima, yes they have a system and you buy the appropriate "landing pads" and crossbars to make a rack. Add your choice of bicycle mounts and you're done.