No, base boards just give you that finished look, like you have upstairs. The carpet should have nailing strips around the edges and the installer will 'kick' it into place, which puts some tension on the carpet to hold it against the nails and remove ripples so it remains flat after it stretches a bit.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70