Web Dispatcher for SAP PI and Web Services Integration

Hi PI experts,

We are having multiple web services to SAP PI AEX Integration scenario's.

I have few doubts if any one can help me?

For security reasons -

1. if We can use Web Dispatcher concept in SAP PI for different multiple web services Integration?

2. Or If it is advisable to use decentralized engine concept?

Thanks in advance.

Regards,

Sarvjeet