Why DCA with dividend investment?
SReits is relatively stable, your capital won't fluctuate much and the income from dividends are quite good provided you have invested a large enough capital to begin with.
But if you DCA starting from a small capital, its gonna take a long time before you see any substantial gains.
If you want to DCA and grow your assets, you should go for growth portfolios, which DigiPortfolio Asia maybe a better choice, since global portfolio isn't an option.