My vote is no..
Do it in series and insulate all piping well.
The different lenghts of piping, both hot and cold will give one heater an advantage if you will, via less friction loss thus it will work more and when it runs out of hot water it will deliver cold water and your other water heater could sit there and stay hot and not be drawn from.
Another important point of parallel installation is the length of the supply piping and delivery piping – they must all be the same length. As shown in the drawing below, section A-E must be the same length as section A-B; C-D must be the same length as F-G; E-F must be the same length as C-B. The same holds true for the hot water outlet side. Because the water pressure is constant along the cold inlet piping and hot water supply piping, the heater with the closest 'run' will do the majority of the work. To prevent this we ‘balance’ the unit with equal pipe lengths. When installing heaters (and storage tanks) in parallel, it is important to accurately plan and measure the distances from the cold water supply pipe to the heaters and from the hot water outlet on the heater to the hot water supply line. This will equalize the work between the two water heaters.