If you want to give PoA to a Turkish Lawyer basically it is possible to do it in three ways. Through Turkish Notary, Local Notary and Turkish Consulate…
How to Give Power of Attorney (PoA) to a Turkish Lawyer
The Consequences of Overstaying 90-Days limit in the European Union
Overstaying 90 days in the EU may lead to fines, entry bans, and deportation. Future visa approvals can be affected, and re-entry restrictions may apply across the Schengen Area.