Hajj & Umrah

Conveying salaams to Nabi (sallallahu alaihi wasallam) from anywhere in the Masjid

Q: 

1. When in Madina Munawwarah, can a person give Salaam to Nabi صلى الله عليه وسلم from anywhere in Masjid Nabawi? 

2. Can the above action also be done while sitting outside the Masjid while at the qibla wall side? 

3. Can salaam also be given to Abu Bakr and Umar رضي الله عنهما from these place or is it only possible when directly in front of the Qabrs?

Putting on ihraam in Jeddah if going there to meet relatives and staying there for a few days

Q: I intend performing Umrah for my deceased parents. I’m travelling to Jeddah and staying for 2 days with my niece who resides there. After I finish Umrah I will go back to Jeddah for a week and then to Doha for 2 days. 

When and where do I don Ihraam? 

Can I perform 1 umrah for both my parents?