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My recommendation : use a supply source capable of delivering in excess of 2.5A so that voltage output remains reliably constant under all 'normal' electrical loadings (ie power draw is well within rated supply).
Then employ a 2.5A fuse on the 12V side, so that if a fault develops, the fuse blows first under 'abnormal' electrical load. (a fault could be an internal short, from a broken wire etc, or a jammed gear drive or overloading/imbalance which forces the motor(s) into overload and over-current).
I suggest a 2.5A fuse as that seems to be the consensus of maximum normal operational current requirement, in this thread.
I trust this helps.
cheers
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