AP3 irons

Yes just like all clubs when you go for a fitting, they will measure lie angle and can bend them. It wouldn't be advised to get them bent more than once or twice

Get fit for lie before custom ordering. Titleist can fit from -2 to +4 with a 0 and +2 head. Off the rack heads are 0 degrees (to spec). Each head is recommended no more than +/- 2 degrees lie or loft.

Yes, mine 718 AP2/AP3 combo are all 2* flat as I'm not that tall...
Mine were ordered by the fitter after the fitting session and Titleist delivered them as per specification - no bending or shaping required.
JT