Why buy three? You can buy one first and use the return on that investment to buy the other two later. At least your commitment is lesser.

Let's say the purchase price is RM100K then your initial investment would be:
1. RM10K deposit
2. Legal fees and stamp duty for loan and SPA- RM3K
3. Renovations and furnishings - RM5K
4. Ads or agent to get tenant - RM1K

So your investment would be RM19K. If you can get rental for RM700 per month and after paying your expenses (mortgage, maintenance etc), you are left with RM200. So your ROI would be (RM200 x 12) divide your investment of RM19K = 12.6%

In 5 years your ROI would have dropped if you do not increase your rental and you have paid off more of your mortgage. Then you should sell and purchase a new property that would give you better ROI.