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ESD protection and GND plane issues for automotive circuit

Latch
I am making a datalogger circuit for automobiles. I am at an impasse. What is more important in automotive design, and smooth GND plane or ESD protection on each input?
 
I have cleared some space on the PCB, only on the bottom layer unfortunately. If I add ESD protection is limits the amount of the GND by almost half.
 
Latch
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    When it comes to automotive, many of the parts are made by someone else. So, keep in mind that no one is protecting their part, or also making sure their part does not interfere with others.
     
    Some rules for design:
    Place all the ESD components (including caps) as close to the connector as possible.
     
    The ground plane often gets segmented up. Ground return current is the most overlooked current. Always allow the ground current to follow the same path as the supply current.
     
    Digital should be separate from analog. Does your design have an IC with both digital and analog?
     
    Keep the ground plane as solid as possible. If the ground starts bouncing, sits at a higher or lower potential, you are stealing voltage from your system. Big trouble. If the IC is supposed to run at 5V, would you want it at 4.75V?
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    When it comes to automotive, many of the parts are made by someone else. So, keep in mind that no one is protecting their part, or also making sure their part does not interfere with others.
     
    Some rules for design:
    Place all the ESD components (including caps) as close to the connector as possible.
     
    The ground plane often gets segmented up. Ground return current is the most overlooked current. Always allow the ground current to follow the same path as the supply current.
     
    Digital should be separate from analog. Does your design have an IC with both digital and analog?
     
    Keep the ground plane as solid as possible. If the ground starts bouncing, sits at a higher or lower potential, you are stealing voltage from your system. Big trouble. If the IC is supposed to run at 5V, would you want it at 4.75V?
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