The cost of compliance is high when you float a company and even the income will be taxed at 30.9% without any basic exemption. Apart from this, there can be tax on deemed dividends, when the money is drawn by you in excess of the dividends, if any, declared by the private company.
If the tenants want to sue you or your properties, they can still do so even if you have a private limited company. They can sue the company as well as the directors. If you appoint someone else as directors, you may run the risk of losing control over the company also.
If you still want to hold the property in the name of a private limited company, one company for one or two properties should be sufficient. This will ensure that the legal cases, if any, filed in relation to one property will not have impact on the performance of other companies.