Ok this is some of the evidence I have collected to show 6 additional ball style phasers on the Reliant version of the Miranda studio model. These phasers are located in 3 pairs; 1 under the impulse engine, and 1 pair each on what look like casemates mounted on each end of the roll bar between the cannons.
pic1) Reliant stern- This shows the back of Reliant during the production of TWoK with a blow up of the impulse engine. you can see the phasers poking out in frame
pic2) Ventral stern Heritage Auction- This shows the underside of the model with the ventral of the impulse engine in frame. you can see the phaser banks with the balls removed. They where cut of during the conversion of the model to the USS Bozeman. The phasers where not repaired for the models finial appearance as the USS Saratoga in the DS 9 pilot a year later.
pic3) Hero Reliant roll bar phaser cannon assembly at some point during the 90s- This shows the entire assembly including both cannons and both phaser casemates. not the casemates are marked above and below red rimed yellow boxes of type used for the phasers elsewhere on the ship but the phasers themselves are the same blue as the cannons and torpedo tubes.
pic4&5) Both are of the battle damaged roll bar phaser cannon assembly These other views are of the same part of the ship from the battle damaged model used for the final sequence in the Mutara Nebula as Enterprise is withdrawing. this is a different model from TWoK but the roll bar phasers are still clearly visible.
This the ambush remastered to 4K 48fps. when the ambush is played at .25 speed you can clearly see the phaser casemates, not the forward cannon firing at Enterprise.