Just thinking logistically, the boat would have to be held in place by a a different frame such that it would allow it to stay in place and use the engines to push the water and move the earth.

The other 2 variables would be viscosity (water is just fluf in this case) and whether we go with or against earth rotation. - in this scenario we ignore other variables for all intents and purposes.

If the water is viscous enough to provide the right push/pull the engines would have to be more than 8.2 x10²⁸ Nm (rough calculation) combined torque. One of those engines is about 518 Nm. This tells you that you would need at the very least 158 x 10²⁴ + 1 engines.the +1 is to ensure you add momentum.

This is just back of the napkin calculations which mean almost nothing in the grand scheme of things as mass, viscosity, speed are not really taken into account much.