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in your case (with the fuses you have and batteries in parallel) taking into account the amps required according to the dna20 datasheet:

If you are going to use those fuses make sure you put them both in parallel (so you get to a 6amps limit). I recon the 1 amps you're going to lose won't matter much unless you are going to work it and work it hard

If you want the added security of a fuse, put that fuse (those 2 you have and that are in parallel) at the end of your positive wires (as raid mentioned).

www.zbattery.com/Connecting-Batteries-in-Series-or-Parallel

2 batteries in series = higher voltage
2 batteries in parallel = more mah, same voltage

So putting 2 16v, 3amp fuses in parallel (Fuses in parallel summate if wired correctly)

So you'll have a 6 amp fuse.
so you are limited to an inputof 6amp and then your fuses blow.

The evolv datasheet says:

Battery:
A single cell rechargeable lithium chemistry battery is recommended. Either a lithium ion or a
lithium polymer type can be used. Any battery used should be rated for a MINIMUM of 7 amps
continuous discharge current. High C rated lithium polymer or IMR cylindrical cells are strongly
preferred.

So if you would take full advantage of the board you're fuses will blow anyway?
Max input for the dna20 mod is 7amps, max output 6amps

indeedy

From the datasheet:

Error Messages
The DNA 20 will indicate a variety of error states.
Check Atomizer: The DNA does not detect an atomizer, or the atomizer has shorted out.
Shorted: The atomizer or wiring are short circuited.
Check Battery: The battery is below 3.1 volts. It probably needs to be charged.
Weak Battery: The battery sags excessively when firing. This typically means the user is not using a high
rate battery, or the battery is old and degraded. It can also mean the battery is not making good contact.
Too Hot: The DNA 20D has onboard temperature sensing. It will shut down and display this message if
the internal board temperature becomes excessive.
Too low power setting: The DNA 20D puts out a minimum of 4 volts. With low power settings (7 to 8
watts) and low resistance atomizers (below 2 ohms) the DNA will sometimes be unable to provide a low
enough power output to be power regulating. If this is the case, the Ohms display will be flashing. The
device will still operate.

The only time (in my opinion) a fuse would be useful is when the wire it's attached to gets lose and touches something else to complete the circuit.
It won't protect you against a battery blowing up.

Sooo, if you make sure your wires are properly soldered and you isolate all your wires, I don't see a reason to add a fuse other than extra added safety upon added safety.

err, why fuses?
I'm sure the DNA got short cut protection

hmpf, find Super-Shiny
where is he in his striped bathing suit!

Yeah, it has connector posts to solder your wire to.

But in the end won't you be soldering the other part of the wires anyway so it shouldn't be to hard to solder an extra pair