Bond funds are suitable for one-time purchase, but if they are fixed, it will cause trouble in calculation time. Therefore, bond funds are generally suitable for Soho. When the redemption fee is zero at a certain time, they can choose to sell and make a new round of investment.
Equity funds are more suitable for fixed investment. That's different. Your positions are more evenly distributed, thus achieving a risk balance. Starting fixed investment when the market falls can make your assets get excess returns.