This may not help you, but...
My 2012 Mazda5 GT has an automatic, but the location of the trans and perhaps the dipstick might be similar to the manual. My trans dipstick is neon orange and is located as follows, when facing the engine from the front:
...About four inches to the right of the right-most edge of the large black plastic engine cover.
...About halfway between the back edge of the large black plastic engine cover and the rear firewall.
...It's located moderately low, but the orange handle is easily seen when looking in the right area (only slight leaning forward is necessary).
Hope this helps.