Capacitor – Ways to Decrease TVS Diode Capacitance

The TVSs on the inputs makes sense and your layout looks reasonable. The question is how far do you want to go to get what level of protection? It's a probability game. Just the TVSs should take care of most ESD events.

If you want to go a little farther, put a resistor in series with each input before the TVS, not between the TVS and the CPLD. This gives the TVS some minimum guaranteed impedance to work against. Going even farther, add a little capacitance accross the TVS. That will slow down the edges of really fast spikes so that the TVS can catch them effectively. It goes on and on, with each level of higher complexity decreasing the probability a damaging event will be encountered even further.

Only you know what environment these boards will be in, the cost of the extra board space, and the cost of failure.

You cannot.

The reason why you can't is because the bidirectional CDSOT23 is a single bidirectional TVS diode when pins 1 and 2 are used as the input and output of the diode(s), so you'd need two of them to be similar to a single NUP2105L.