If there would be an issue of Maris Ayin it is sufficient to place a siman see the sugya of Basar in Almond Milk brought in the rema in 87:3. Furthermore, there are those that contend that once something becomes common enough the problem of maris ayin goes away completely.
“Rav Yonason Eibeshutz[9] extrapolates and expands on this concept even further, applying it as a general halachic rule across the board: any time that the questionable object (or action) becomes commonplace, Maris Ayin no longer applies, as it will no longer arouse suspicion[10]. The example he gives is if in a place where cooking in almond milk is the norm, then accordingly it would not be necessary to place almonds next to the pot, as the average onlooker would simply assume that one is cooking in pareve almond milk, and not real milk. Other later authorities, including the Maharsham, and Yad Yehuda[11], have echoed Rav Eibeshutz’s ruling.”